Finding the Fourth Proportional to 76,131.28, 105,057.86 and 42,137.74

Step by Step Solution

1. Step 1: Write the proportion equation
   76,131.28 : 105,057.86 = 42,137.74 : x
2. Step 2: Convert to fraction form
   76,131.28/105,057.86 = 42,137.74/x
3. Step 3: Cross multiply
   76,131.28x = 105,057.86 × 42,137.74
4. Step 4: Simplify right side
   76,131.28x = 4,426,900,789.64
5. Step 5: Solve for x
   x = 4,426,900,789.64/76,131.28
6. Step 6: Final answer
   x = 58,148.25