Finding the Fourth Proportional to 31,032.50, 42,799.92 and 20,276.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,032.50 : 42,799.92 = 20,276.50 : x
2. Step 2: Convert to fraction form
   31,032.50/42,799.92 = 20,276.50/x
3. Step 3: Cross multiply
   31,032.50x = 42,799.92 × 20,276.50
4. Step 4: Simplify right side
   31,032.50x = 867,832,577.88
5. Step 5: Solve for x
   x = 867,832,577.88/31,032.50
6. Step 6: Final answer
   x = 27,965.28