Finding the Fourth Proportional to 83,498.60, 115,272.42 and 56,783.72

Step by Step Solution

1. Step 1: Write the proportion equation
   83,498.60 : 115,272.42 = 56,783.72 : x
2. Step 2: Convert to fraction form
   83,498.60/115,272.42 = 56,783.72/x
3. Step 3: Cross multiply
   83,498.60x = 115,272.42 × 56,783.72
4. Step 4: Simplify right side
   83,498.60x = 6,545,596,821.00
5. Step 5: Solve for x
   x = 6,545,596,821.00/83,498.60
6. Step 6: Final answer
   x = 78,391.70