Finding the Fourth Proportional to 99,870.72, 137,785.78 and 59,026.28

Step by Step Solution

1. Step 1: Write the proportion equation
   99,870.72 : 137,785.78 = 59,026.28 : x
2. Step 2: Convert to fraction form
   99,870.72/137,785.78 = 59,026.28/x
3. Step 3: Cross multiply
   99,870.72x = 137,785.78 × 59,026.28
4. Step 4: Simplify right side
   99,870.72x = 8,132,981,678.04
5. Step 5: Solve for x
   x = 8,132,981,678.04/99,870.72
6. Step 6: Final answer
   x = 81,435.09