Finding the Fourth Proportional to 99,285.39, 137,016.90 and 56,857.59

Step by Step Solution

1. Step 1: Write the proportion equation
   99,285.39 : 137,016.90 = 56,857.59 : x
2. Step 2: Convert to fraction form
   99,285.39/137,016.90 = 56,857.59/x
3. Step 3: Cross multiply
   99,285.39x = 137,016.90 × 56,857.59
4. Step 4: Simplify right side
   99,285.39x = 7,790,450,723.27
5. Step 5: Solve for x
   x = 7,790,450,723.27/99,285.39
6. Step 6: Final answer
   x = 78,465.23