Finding the Fourth Proportional to 13,328.72, 18,393.78 and 7,666.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,328.72 : 18,393.78 = 7,666.28 : x
2. Step 2: Convert to fraction form
   13,328.72/18,393.78 = 7,666.28/x
3. Step 3: Cross multiply
   13,328.72x = 18,393.78 × 7,666.28
4. Step 4: Simplify right side
   13,328.72x = 141,011,867.74
5. Step 5: Solve for x
   x = 141,011,867.74/13,328.72
6. Step 6: Final answer
   x = 10,579.55