Finding the Fourth Proportional to 12,950.33, 17,870.76 and 7,643.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,950.33 : 17,870.76 = 7,643.21 : x
2. Step 2: Convert to fraction form
   12,950.33/17,870.76 = 7,643.21/x
3. Step 3: Cross multiply
   12,950.33x = 17,870.76 × 7,643.21
4. Step 4: Simplify right side
   12,950.33x = 136,589,882.19
5. Step 5: Solve for x
   x = 136,589,882.19/12,950.33
6. Step 6: Final answer
   x = 10,547.22