Finding the Fourth Proportional to 261,111.73, 391,625.55 and 71,527.78

Step by Step Solution

1. Step 1: Write the proportion equation
   261,111.73 : 391,625.55 = 71,527.78 : x
2. Step 2: Convert to fraction form
   261,111.73/391,625.55 = 71,527.78/x
3. Step 3: Cross multiply
   261,111.73x = 391,625.55 × 71,527.78
4. Step 4: Simplify right side
   261,111.73x = 28,012,106,182.78
5. Step 5: Solve for x
   x = 28,012,106,182.78/261,111.73
6. Step 6: Final answer
   x = 107,280.15