Finding the Fourth Proportional to 12,788.30, 17,632.42 and 10,666.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,788.30 : 17,632.42 = 10,666.91 : x
2. Step 2: Convert to fraction form
   12,788.30/17,632.42 = 10,666.91/x
3. Step 3: Cross multiply
   12,788.30x = 17,632.42 × 10,666.91
4. Step 4: Simplify right side
   12,788.30x = 188,083,454.64
5. Step 5: Solve for x
   x = 188,083,454.64/12,788.30
6. Step 6: Final answer
   x = 14,707.46