Finding the Fourth Proportional to 977,313,510.72, 1,465,970,538 and 287,220,726.72

Step by Step Solution

1. Step 1: Write the proportion equation
   977,313,510.72 : 1,465,970,538 = 287,220,726.72 : x
2. Step 2: Convert to fraction form
   977,313,510.72/1,465,970,538 = 287,220,726.72/x
3. Step 3: Cross multiply
   977,313,510.72x = 1,465,970,538 × 287,220,726.72
4. Step 4: Simplify right side
   977,313,510.72x = 421,057,123,274,469,440
5. Step 5: Solve for x
   x = 421,057,123,274,469,440/977,313,510.72
6. Step 6: Final answer
   x = 430,831,169.99