Finding the Fourth Proportional to 21,225.40, 29,288.72 and 12,271.55

Step by Step Solution

1. Step 1: Write the proportion equation
   21,225.40 : 29,288.72 = 12,271.55 : x
2. Step 2: Convert to fraction form
   21,225.40/29,288.72 = 12,271.55/x
3. Step 3: Cross multiply
   21,225.40x = 29,288.72 × 12,271.55
4. Step 4: Simplify right side
   21,225.40x = 359,417,876.15
5. Step 5: Solve for x
   x = 359,417,876.15/21,225.40
6. Step 6: Final answer
   x = 16,933.39