Finding the Fourth Proportional to 12,666.32, 17,467.84 and 7,880.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,666.32 : 17,467.84 = 7,880.12 : x
2. Step 2: Convert to fraction form
   12,666.32/17,467.84 = 7,880.12/x
3. Step 3: Cross multiply
   12,666.32x = 17,467.84 × 7,880.12
4. Step 4: Simplify right side
   12,666.32x = 137,648,675.34
5. Step 5: Solve for x
   x = 137,648,675.34/12,666.32
6. Step 6: Final answer
   x = 10,867.30