Finding the Fourth Proportional to 77,131.23, 106,440.39 and 43,139.31

Step by Step Solution

1. Step 1: Write the proportion equation
   77,131.23 : 106,440.39 = 43,139.31 : x
2. Step 2: Convert to fraction form
   77,131.23/106,440.39 = 43,139.31/x
3. Step 3: Cross multiply
   77,131.23x = 106,440.39 × 43,139.31
4. Step 4: Simplify right side
   77,131.23x = 4,591,764,980.73
5. Step 5: Solve for x
   x = 4,591,764,980.73/77,131.23
6. Step 6: Final answer
   x = 59,531.85