Finding the Fourth Proportional to 85,782.98, 128,499.42 and 44,142.50

Step by Step Solution

1. Step 1: Write the proportion equation
   85,782.98 : 128,499.42 = 44,142.50 : x
2. Step 2: Convert to fraction form
   85,782.98/128,499.42 = 44,142.50/x
3. Step 3: Cross multiply
   85,782.98x = 128,499.42 × 44,142.50
4. Step 4: Simplify right side
   85,782.98x = 5,672,285,647.35
5. Step 5: Solve for x
   x = 5,672,285,647.35/85,782.98
6. Step 6: Final answer
   x = 66,123.67