Finding the Fourth Proportional to 76,139.87, 105,071.46 and 42,148.36

Step by Step Solution

1. Step 1: Write the proportion equation
   76,139.87 : 105,071.46 = 42,148.36 : x
2. Step 2: Convert to fraction form
   76,139.87/105,071.46 = 42,148.36/x
3. Step 3: Cross multiply
   76,139.87x = 105,071.46 × 42,148.36
4. Step 4: Simplify right side
   76,139.87x = 4,428,589,695.09
5. Step 5: Solve for x
   x = 4,428,589,695.09/76,139.87
6. Step 6: Final answer
   x = 58,163.88