Finding the Fourth Proportional to 77,129.69, 106,434.54 and 42,672.42

Step by Step Solution

1. Step 1: Write the proportion equation
   77,129.69 : 106,434.54 = 42,672.42 : x
2. Step 2: Convert to fraction form
   77,129.69/106,434.54 = 42,672.42/x
3. Step 3: Cross multiply
   77,129.69x = 106,434.54 × 42,672.42
4. Step 4: Simplify right side
   77,129.69x = 4,541,819,393.39
5. Step 5: Solve for x
   x = 4,541,819,393.39/77,129.69
6. Step 6: Final answer
   x = 58,885.49