Finding the Fourth Proportional to 31,385.04, 43,323.15 and 20,789.04

Step by Step Solution

1. Step 1: Write the proportion equation
   31,385.04 : 43,323.15 = 20,789.04 : x
2. Step 2: Convert to fraction form
   31,385.04/43,323.15 = 20,789.04/x
3. Step 3: Cross multiply
   31,385.04x = 43,323.15 × 20,789.04
4. Step 4: Simplify right side
   31,385.04x = 900,646,698.28
5. Step 5: Solve for x
   x = 900,646,698.28/31,385.04
6. Step 6: Final answer
   x = 28,696.69