Finding the Fourth Proportional to 76,139.86, 105,071.46 and 42,148.37

Step by Step Solution

1. Step 1: Write the proportion equation
   76,139.86 : 105,071.46 = 42,148.37 : x
2. Step 2: Convert to fraction form
   76,139.86/105,071.46 = 42,148.37/x
3. Step 3: Cross multiply
   76,139.86x = 105,071.46 × 42,148.37
4. Step 4: Simplify right side
   76,139.86x = 4,428,590,247.16
5. Step 5: Solve for x
   x = 4,428,590,247.16/76,139.86
6. Step 6: Final answer
   x = 58,163.89