Finding the Fourth Proportional to 77,891.55, 107,490.38 and 42,081.54

Step by Step Solution

1. Step 1: Write the proportion equation
   77,891.55 : 107,490.38 = 42,081.54 : x
2. Step 2: Convert to fraction form
   77,891.55/107,490.38 = 42,081.54/x
3. Step 3: Cross multiply
   77,891.55x = 107,490.38 × 42,081.54
4. Step 4: Simplify right side
   77,891.55x = 4,523,360,725.59
5. Step 5: Solve for x
   x = 4,523,360,725.59/77,891.55
6. Step 6: Final answer
   x = 58,072.55