Finding the Fourth Proportional to 12,665.53, 19,005.13 and 5,275.09

Step by Step Solution

1. Step 1: Write the proportion equation
   12,665.53 : 19,005.13 = 5,275.09 : x
2. Step 2: Convert to fraction form
   12,665.53/19,005.13 = 5,275.09/x
3. Step 3: Cross multiply
   12,665.53x = 19,005.13 × 5,275.09
4. Step 4: Simplify right side
   12,665.53x = 100,253,663.00
5. Step 5: Solve for x
   x = 100,253,663.00/12,665.53
6. Step 6: Final answer
   x = 7,915.48