Finding the Fourth Proportional to 78,087.40, 107,759.31 and 42,277.12

Step by Step Solution

1. Step 1: Write the proportion equation
   78,087.40 : 107,759.31 = 42,277.12 : x
2. Step 2: Convert to fraction form
   78,087.40/107,759.31 = 42,277.12/x
3. Step 3: Cross multiply
   78,087.40x = 107,759.31 × 42,277.12
4. Step 4: Simplify right side
   78,087.40x = 4,555,753,279.99
5. Step 5: Solve for x
   x = 4,555,753,279.99/78,087.40
6. Step 6: Final answer
   x = 58,341.72