Finding the Fourth Proportional to 21,499.40, 29,669.16 and 12,545.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,499.40 : 29,669.16 = 12,545.18 : x
2. Step 2: Convert to fraction form
   21,499.40/29,669.16 = 12,545.18/x
3. Step 3: Cross multiply
   21,499.40x = 29,669.16 × 12,545.18
4. Step 4: Simplify right side
   21,499.40x = 372,204,952.65
5. Step 5: Solve for x
   x = 372,204,952.65/21,499.40
6. Step 6: Final answer
   x = 17,312.34