Finding the Fourth Proportional to 76,131.14, 105,058.28 and 42,139.69

Step by Step Solution

1. Step 1: Write the proportion equation
   76,131.14 : 105,058.28 = 42,139.69 : x
2. Step 2: Convert to fraction form
   76,131.14/105,058.28 = 42,139.69/x
3. Step 3: Cross multiply
   76,131.14x = 105,058.28 × 42,139.69
4. Step 4: Simplify right side
   76,131.14x = 4,427,123,351.13
5. Step 5: Solve for x
   x = 4,427,123,351.13/76,131.14
6. Step 6: Final answer
   x = 58,151.28