Finding the Fourth Proportional to 31,182.96, 42,999.72 and 20,559

Step by Step Solution

1. Step 1: Write the proportion equation
   31,182.96 : 42,999.72 = 20,559 : x
2. Step 2: Convert to fraction form
   31,182.96/42,999.72 = 20,559/x
3. Step 3: Cross multiply
   31,182.96x = 42,999.72 × 20,559
4. Step 4: Simplify right side
   31,182.96x = 884,031,243.48
5. Step 5: Solve for x
   x = 884,031,243.48/31,182.96
6. Step 6: Final answer
   x = 28,349.82