Finding the Fourth Proportional to 21,488.56, 29,655.72 and 12,057.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,488.56 : 29,655.72 = 12,057.52 : x
2. Step 2: Convert to fraction form
   21,488.56/29,655.72 = 12,057.52/x
3. Step 3: Cross multiply
   21,488.56x = 29,655.72 × 12,057.52
4. Step 4: Simplify right side
   21,488.56x = 357,574,437.01
5. Step 5: Solve for x
   x = 357,574,437.01/21,488.56
6. Step 6: Final answer
   x = 16,640.22