Finding the Fourth Proportional to 39,597.83, 54,642.71 and 21,689.72

Step by Step Solution

1. Step 1: Write the proportion equation
   39,597.83 : 54,642.71 = 21,689.72 : x
2. Step 2: Convert to fraction form
   39,597.83/54,642.71 = 21,689.72/x
3. Step 3: Cross multiply
   39,597.83x = 54,642.71 × 21,689.72
4. Step 4: Simplify right side
   39,597.83x = 1,185,185,065.86
5. Step 5: Solve for x
   x = 1,185,185,065.86/39,597.83
6. Step 6: Final answer
   x = 29,930.55