Finding the Fourth Proportional to 56,105.50, 77,420.05 and 39,146.20

Step by Step Solution

1. Step 1: Write the proportion equation
   56,105.50 : 77,420.05 = 39,146.20 : x
2. Step 2: Convert to fraction form
   56,105.50/77,420.05 = 39,146.20/x
3. Step 3: Cross multiply
   56,105.50x = 77,420.05 × 39,146.20
4. Step 4: Simplify right side
   56,105.50x = 3,030,700,761.31
5. Step 5: Solve for x
   x = 3,030,700,761.31/56,105.50
6. Step 6: Final answer
   x = 54,017.89