Finding the Fourth Proportional to 12,949.33, 17,869.38 and 7,642.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,949.33 : 17,869.38 = 7,642.21 : x
2. Step 2: Convert to fraction form
   12,949.33/17,869.38 = 7,642.21/x
3. Step 3: Cross multiply
   12,949.33x = 17,869.38 × 7,642.21
4. Step 4: Simplify right side
   12,949.33x = 136,561,554.53
5. Step 5: Solve for x
   x = 136,561,554.53/12,949.33
6. Step 6: Final answer
   x = 10,545.84