Finding the Fourth Proportional to 12,978,970.86, 17,910,875.23 and 7,177,997.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978,970.86 : 17,910,875.23 = 7,177,997.10 : x
2. Step 2: Convert to fraction form
   12,978,970.86/17,910,875.23 = 7,177,997.10/x
3. Step 3: Cross multiply
   12,978,970.86x = 17,910,875.23 × 7,177,997.10
4. Step 4: Simplify right side
   12,978,970.86x = 128,564,210,459,401.83
5. Step 5: Solve for x
   x = 128,564,210,459,401.83/12,978,970.86
6. Step 6: Final answer
   x = 9,905,578.17