Finding the Fourth Proportional to 15,399.30, 23,066.55 and 12,807.30

Step by Step Solution

1. Step 1: Write the proportion equation
   15,399.30 : 23,066.55 = 12,807.30 : x
2. Step 2: Convert to fraction form
   15,399.30/23,066.55 = 12,807.30/x
3. Step 3: Cross multiply
   15,399.30x = 23,066.55 × 12,807.30
4. Step 4: Simplify right side
   15,399.30x = 295,420,225.82
5. Step 5: Solve for x
   x = 295,420,225.82/15,399.30
6. Step 6: Final answer
   x = 19,184.00