Finding the Fourth Proportional to 57,218.08, 78,960.56 and 31,724.45

Step by Step Solution

1. Step 1: Write the proportion equation
   57,218.08 : 78,960.56 = 31,724.45 : x
2. Step 2: Convert to fraction form
   57,218.08/78,960.56 = 31,724.45/x
3. Step 3: Cross multiply
   57,218.08x = 78,960.56 × 31,724.45
4. Step 4: Simplify right side
   57,218.08x = 2,504,980,337.69
5. Step 5: Solve for x
   x = 2,504,980,337.69/57,218.08
6. Step 6: Final answer
   x = 43,779.52