Finding the Fourth Proportional to 12,369.57, 18,547.42 and 5,345.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,369.57 : 18,547.42 = 5,345.20 : x
2. Step 2: Convert to fraction form
   12,369.57/18,547.42 = 5,345.20/x
3. Step 3: Cross multiply
   12,369.57x = 18,547.42 × 5,345.20
4. Step 4: Simplify right side
   12,369.57x = 99,139,669.38
5. Step 5: Solve for x
   x = 99,139,669.38/12,369.57
6. Step 6: Final answer
   x = 8,014.80