Finding the Fourth Proportional to 71,932.23, 107,935.43 and 31,978.78

Step by Step Solution

1. Step 1: Write the proportion equation
   71,932.23 : 107,935.43 = 31,978.78 : x
2. Step 2: Convert to fraction form
   71,932.23/107,935.43 = 31,978.78/x
3. Step 3: Cross multiply
   71,932.23x = 107,935.43 × 31,978.78
4. Step 4: Simplify right side
   71,932.23x = 3,451,642,940.44
5. Step 5: Solve for x
   x = 3,451,642,940.44/71,932.23
6. Step 6: Final answer
   x = 47,984.65