Finding the Fourth Proportional to 72,807.30, 99,818.78 and 71,478.63

Step by Step Solution

1. Step 1: Write the proportion equation
   72,807.30 : 99,818.78 = 71,478.63 : x
2. Step 2: Convert to fraction form
   72,807.30/99,818.78 = 71,478.63/x
3. Step 3: Cross multiply
   72,807.30x = 99,818.78 × 71,478.63
4. Step 4: Simplify right side
   72,807.30x = 7,134,909,285.28
5. Step 5: Solve for x
   x = 7,134,909,285.28/72,807.30
6. Step 6: Final answer
   x = 97,997.17