Finding the Fourth Proportional to 56,940.32, 78,578.70 and 31,448

Step by Step Solution

1. Step 1: Write the proportion equation
   56,940.32 : 78,578.70 = 31,448 : x
2. Step 2: Convert to fraction form
   56,940.32/78,578.70 = 31,448/x
3. Step 3: Cross multiply
   56,940.32x = 78,578.70 × 31,448
4. Step 4: Simplify right side
   56,940.32x = 2,471,142,957.60
5. Step 5: Solve for x
   x = 2,471,142,957.60/56,940.32
6. Step 6: Final answer
   x = 43,398.82