Finding the Fourth Proportional to 13,522,490.98, 18,658,973.01 and 7,639,978.57

Step by Step Solution

1. Step 1: Write the proportion equation
   13,522,490.98 : 18,658,973.01 = 7,639,978.57 : x
2. Step 2: Convert to fraction form
   13,522,490.98/18,658,973.01 = 7,639,978.57/x
3. Step 3: Cross multiply
   13,522,490.98x = 18,658,973.01 × 7,639,978.57
4. Step 4: Simplify right side
   13,522,490.98x = 142,554,153,841,313.56
5. Step 5: Solve for x
   x = 142,554,153,841,313.56/13,522,490.98
6. Step 6: Final answer
   x = 10,542,003.99