Finding the Fourth Proportional to 56,724.54, 78,278.76 and 35,515.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,724.54 : 78,278.76 = 35,515.50 : x
2. Step 2: Convert to fraction form
   56,724.54/78,278.76 = 35,515.50/x
3. Step 3: Cross multiply
   56,724.54x = 78,278.76 × 35,515.50
4. Step 4: Simplify right side
   56,724.54x = 2,780,109,300.78
5. Step 5: Solve for x
   x = 2,780,109,300.78/56,724.54
6. Step 6: Final answer
   x = 49,010.70