Finding the Fourth Proportional to 22,638.72, 34,013.40 and 21,379.80

Step by Step Solution

1. Step 1: Write the proportion equation
   22,638.72 : 34,013.40 = 21,379.80 : x
2. Step 2: Convert to fraction form
   22,638.72/34,013.40 = 21,379.80/x
3. Step 3: Cross multiply
   22,638.72x = 34,013.40 × 21,379.80
4. Step 4: Simplify right side
   22,638.72x = 727,199,689.32
5. Step 5: Solve for x
   x = 727,199,689.32/22,638.72
6. Step 6: Final answer
   x = 32,121.94