Finding the Fourth Proportional to 76,387, 105,414.78 and 42,853.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,387 : 105,414.78 = 42,853.72 : x
2. Step 2: Convert to fraction form
   76,387/105,414.78 = 42,853.72/x
3. Step 3: Cross multiply
   76,387x = 105,414.78 × 42,853.72
4. Step 4: Simplify right side
   76,387x = 4,517,415,465.98
5. Step 5: Solve for x
   x = 4,517,415,465.98/76,387
6. Step 6: Final answer
   x = 59,138.54