Finding the Fourth Proportional to 30,662.88, 42,326.30 and 17,920.20

Step by Step Solution

1. Step 1: Write the proportion equation
   30,662.88 : 42,326.30 = 17,920.20 : x
2. Step 2: Convert to fraction form
   30,662.88/42,326.30 = 17,920.20/x
3. Step 3: Cross multiply
   30,662.88x = 42,326.30 × 17,920.20
4. Step 4: Simplify right side
   30,662.88x = 758,495,761.26
5. Step 5: Solve for x
   x = 758,495,761.26/30,662.88
6. Step 6: Final answer
   x = 24,736.61