Finding the Fourth Proportional to 78,599.96, 108,470.20 and 42,790.57

Step by Step Solution

1. Step 1: Write the proportion equation
   78,599.96 : 108,470.20 = 42,790.57 : x
2. Step 2: Convert to fraction form
   78,599.96/108,470.20 = 42,790.57/x
3. Step 3: Cross multiply
   78,599.96x = 108,470.20 × 42,790.57
4. Step 4: Simplify right side
   78,599.96x = 4,641,501,686.01
5. Step 5: Solve for x
   x = 4,641,501,686.01/78,599.96
6. Step 6: Final answer
   x = 59,052.21