Finding the Fourth Proportional to 85,499.94, 128,252.10 and 40,510.74

Step by Step Solution

1. Step 1: Write the proportion equation
   85,499.94 : 128,252.10 = 40,510.74 : x
2. Step 2: Convert to fraction form
   85,499.94/128,252.10 = 40,510.74/x
3. Step 3: Cross multiply
   85,499.94x = 128,252.10 × 40,510.74
4. Step 4: Simplify right side
   85,499.94x = 5,195,587,477.55
5. Step 5: Solve for x
   x = 5,195,587,477.55/85,499.94
6. Step 6: Final answer
   x = 60,767.15