Finding the Fourth Proportional to 56,661, 78,157.71 and 40,766.97

Step by Step Solution

1. Step 1: Write the proportion equation
   56,661 : 78,157.71 = 40,766.97 : x
2. Step 2: Convert to fraction form
   56,661/78,157.71 = 40,766.97/x
3. Step 3: Cross multiply
   56,661x = 78,157.71 × 40,766.97
4. Step 4: Simplify right side
   56,661x = 3,186,253,018.84
5. Step 5: Solve for x
   x = 3,186,253,018.84/56,661
6. Step 6: Final answer
   x = 56,233.62