Finding the Fourth Proportional to 21,758.50, 32,587.13 and 21,159.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,758.50 : 32,587.13 = 21,159.89 : x
2. Step 2: Convert to fraction form
   21,758.50/32,587.13 = 21,159.89/x
3. Step 3: Cross multiply
   21,758.50x = 32,587.13 × 21,159.89
4. Step 4: Simplify right side
   21,758.50x = 689,540,086.22
5. Step 5: Solve for x
   x = 689,540,086.22/21,758.50
6. Step 6: Final answer
   x = 31,690.61