Finding the Fourth Proportional to 76,139.60, 105,069.24 and 42,149.36

Step by Step Solution

1. Step 1: Write the proportion equation
   76,139.60 : 105,069.24 = 42,149.36 : x
2. Step 2: Convert to fraction form
   76,139.60/105,069.24 = 42,149.36/x
3. Step 3: Cross multiply
   76,139.60x = 105,069.24 × 42,149.36
4. Step 4: Simplify right side
   76,139.60x = 4,428,601,221.69
5. Step 5: Solve for x
   x = 4,428,601,221.69/76,139.60
6. Step 6: Final answer
   x = 58,164.23