Finding the Fourth Proportional to 31,042.74, 42,848.06 and 20,289.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,042.74 : 42,848.06 = 20,289.18 : x
2. Step 2: Convert to fraction form
   31,042.74/42,848.06 = 20,289.18/x
3. Step 3: Cross multiply
   31,042.74x = 42,848.06 × 20,289.18
4. Step 4: Simplify right side
   31,042.74x = 869,352,061.23
5. Step 5: Solve for x
   x = 869,352,061.23/31,042.74
6. Step 6: Final answer
   x = 28,005.00