Finding the Fourth Proportional to 103,081.72, 142,253.32 and 57,759.80

Step by Step Solution

1. Step 1: Write the proportion equation
   103,081.72 : 142,253.32 = 57,759.80 : x
2. Step 2: Convert to fraction form
   103,081.72/142,253.32 = 57,759.80/x
3. Step 3: Cross multiply
   103,081.72x = 142,253.32 × 57,759.80
4. Step 4: Simplify right side
   103,081.72x = 8,216,523,312.54
5. Step 5: Solve for x
   x = 8,216,523,312.54/103,081.72
6. Step 6: Final answer
   x = 79,708.83