Finding the Fourth Proportional to 77,891.92, 107,490.90 and 42,081.91

Step by Step Solution

1. Step 1: Write the proportion equation
   77,891.92 : 107,490.90 = 42,081.91 : x
2. Step 2: Convert to fraction form
   77,891.92/107,490.90 = 42,081.91/x
3. Step 3: Cross multiply
   77,891.92x = 107,490.90 × 42,081.91
4. Step 4: Simplify right side
   77,891.92x = 4,523,422,379.62
5. Step 5: Solve for x
   x = 4,523,422,379.62/77,891.92
6. Step 6: Final answer
   x = 58,073.06