Finding the Fourth Proportional to 72,901.76, 99,948.31 and 71,573.15

Step by Step Solution

1. Step 1: Write the proportion equation
   72,901.76 : 99,948.31 = 71,573.15 : x
2. Step 2: Convert to fraction form
   72,901.76/99,948.31 = 71,573.15/x
3. Step 3: Cross multiply
   72,901.76x = 99,948.31 × 71,573.15
4. Step 4: Simplify right side
   72,901.76x = 7,153,615,454.81
5. Step 5: Solve for x
   x = 7,153,615,454.81/72,901.76
6. Step 6: Final answer
   x = 98,126.79