Finding the Fourth Proportional to 51,978.08, 71,728.80 and 31,831.76

Step by Step Solution

1. Step 1: Write the proportion equation
   51,978.08 : 71,728.80 = 31,831.76 : x
2. Step 2: Convert to fraction form
   51,978.08/71,728.80 = 31,831.76/x
3. Step 3: Cross multiply
   51,978.08x = 71,728.80 × 31,831.76
4. Step 4: Simplify right side
   51,978.08x = 2,283,253,946.69
5. Step 5: Solve for x
   x = 2,283,253,946.69/51,978.08
6. Step 6: Final answer
   x = 43,927.25