Finding the Fourth Proportional to 85,663.74, 128,541.78 and 40,674.72

Step by Step Solution

1. Step 1: Write the proportion equation
   85,663.74 : 128,541.78 = 40,674.72 : x
2. Step 2: Convert to fraction form
   85,663.74/128,541.78 = 40,674.72/x
3. Step 3: Cross multiply
   85,663.74x = 128,541.78 × 40,674.72
4. Step 4: Simplify right side
   85,663.74x = 5,228,400,909.80
5. Step 5: Solve for x
   x = 5,228,400,909.80/85,663.74
6. Step 6: Final answer
   x = 61,034.00