Finding the Fourth Proportional to 99,873.17, 137,789.16 and 59,028.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,873.17 : 137,789.16 = 59,028.72 : x
2. Step 2: Convert to fraction form
   99,873.17/137,789.16 = 59,028.72/x
3. Step 3: Cross multiply
   99,873.17x = 137,789.16 × 59,028.72
4. Step 4: Simplify right side
   99,873.17x = 8,133,517,449.53
5. Step 5: Solve for x
   x = 8,133,517,449.53/99,873.17
6. Step 6: Final answer
   x = 81,438.47