Finding the Fourth Proportional to 13,300.72, 19,965.66 and 5,515

Step by Step Solution

1. Step 1: Write the proportion equation
   13,300.72 : 19,965.66 = 5,515 : x
2. Step 2: Convert to fraction form
   13,300.72/19,965.66 = 5,515/x
3. Step 3: Cross multiply
   13,300.72x = 19,965.66 × 5,515
4. Step 4: Simplify right side
   13,300.72x = 110,110,614.90
5. Step 5: Solve for x
   x = 110,110,614.90/13,300.72
6. Step 6: Final answer
   x = 8,278.55