Finding the Fourth Proportional to 12,815.38, 19,225.90 and 5,426.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,815.38 : 19,225.90 = 5,426.15 : x
2. Step 2: Convert to fraction form
   12,815.38/19,225.90 = 5,426.15/x
3. Step 3: Cross multiply
   12,815.38x = 19,225.90 × 5,426.15
4. Step 4: Simplify right side
   12,815.38x = 104,322,617.29
5. Step 5: Solve for x
   x = 104,322,617.29/12,815.38
6. Step 6: Final answer
   x = 8,140.43