Finding the Fourth Proportional to 12,607.38, 17,391.33 and 7,890.66

Step by Step Solution

1. Step 1: Write the proportion equation
   12,607.38 : 17,391.33 = 7,890.66 : x
2. Step 2: Convert to fraction form
   12,607.38/17,391.33 = 7,890.66/x
3. Step 3: Cross multiply
   12,607.38x = 17,391.33 × 7,890.66
4. Step 4: Simplify right side
   12,607.38x = 137,229,071.98
5. Step 5: Solve for x
   x = 137,229,071.98/12,607.38
6. Step 6: Final answer
   x = 10,884.82