Finding the Fourth Proportional to 21,348.50, 32,019.75 and 13,426.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,348.50 : 32,019.75 = 13,426.88 : x
2. Step 2: Convert to fraction form
   21,348.50/32,019.75 = 13,426.88/x
3. Step 3: Cross multiply
   21,348.50x = 32,019.75 × 13,426.88
4. Step 4: Simplify right side
   21,348.50x = 429,925,180.78
5. Step 5: Solve for x
   x = 429,925,180.78/21,348.50
6. Step 6: Final answer
   x = 20,138.43