Finding the Fourth Proportional to 77,891.67, 107,490.56 and 42,081.66

Step by Step Solution

1. Step 1: Write the proportion equation
   77,891.67 : 107,490.56 = 42,081.66 : x
2. Step 2: Convert to fraction form
   77,891.67/107,490.56 = 42,081.66/x
3. Step 3: Cross multiply
   77,891.67x = 107,490.56 × 42,081.66
4. Step 4: Simplify right side
   77,891.67x = 4,523,380,988.72
5. Step 5: Solve for x
   x = 4,523,380,988.72/77,891.67
6. Step 6: Final answer
   x = 58,072.72