Finding the Fourth Proportional to 12,915.96, 19,356.92 and 5,120.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,915.96 : 19,356.92 = 5,120.52 : x
2. Step 2: Convert to fraction form
   12,915.96/19,356.92 = 5,120.52/x
3. Step 3: Cross multiply
   12,915.96x = 19,356.92 × 5,120.52
4. Step 4: Simplify right side
   12,915.96x = 99,117,496.00
5. Step 5: Solve for x
   x = 99,117,496.00/12,915.96
6. Step 6: Final answer
   x = 7,674.03