Finding the Fourth Proportional to 31,098.72, 42,947.76 and 20,496.48

Step by Step Solution

1. Step 1: Write the proportion equation
   31,098.72 : 42,947.76 = 20,496.48 : x
2. Step 2: Convert to fraction form
   31,098.72/42,947.76 = 20,496.48/x
3. Step 3: Cross multiply
   31,098.72x = 42,947.76 × 20,496.48
4. Step 4: Simplify right side
   31,098.72x = 880,277,903.88
5. Step 5: Solve for x
   x = 880,277,903.88/31,098.72
6. Step 6: Final answer
   x = 28,305.92