Finding the Fourth Proportional to 21,761.76, 32,635.72 and 13,429.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,761.76 : 32,635.72 = 13,429.32 : x
2. Step 2: Convert to fraction form
   21,761.76/32,635.72 = 13,429.32/x
3. Step 3: Cross multiply
   21,761.76x = 32,635.72 × 13,429.32
4. Step 4: Simplify right side
   21,761.76x = 438,275,527.31
5. Step 5: Solve for x
   x = 438,275,527.31/21,761.76
6. Step 6: Final answer
   x = 20,139.71