Finding the Fourth Proportional to 8,720,072,978.49, 13,060,974,083.42 and 7,208,978,430.45

Step by Step Solution

1. Step 1: Write the proportion equation
   8,720,072,978.49 : 13,060,974,083.42 = 7,208,978,430.45 : x
2. Step 2: Convert to fraction form
   8,720,072,978.49/13,060,974,083.42 = 7,208,978,430.45/x
3. Step 3: Cross multiply
   8,720,072,978.49x = 13,060,974,083.42 × 7,208,978,430.45
4. Step 4: Simplify right side
   8,720,072,978.49x = 94,156,280,448,005,193,728
5. Step 5: Solve for x
   x = 94,156,280,448,005,193,728/8,720,072,978.49
6. Step 6: Final answer
   x = 10,797,648,216.97