Finding the Fourth Proportional to 30,659.01, 42,293.54 and 20,590.31

Step by Step Solution

1. Step 1: Write the proportion equation
   30,659.01 : 42,293.54 = 20,590.31 : x
2. Step 2: Convert to fraction form
   30,659.01/42,293.54 = 20,590.31/x
3. Step 3: Cross multiply
   30,659.01x = 42,293.54 × 20,590.31
4. Step 4: Simplify right side
   30,659.01x = 870,836,785.18
5. Step 5: Solve for x
   x = 870,836,785.18/30,659.01
6. Step 6: Final answer
   x = 28,403.94