Finding the Fourth Proportional to 12,145.17, 18,211.50 and 5,565.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,145.17 : 18,211.50 = 5,565.72 : x
2. Step 2: Convert to fraction form
   12,145.17/18,211.50 = 5,565.72/x
3. Step 3: Cross multiply
   12,145.17x = 18,211.50 × 5,565.72
4. Step 4: Simplify right side
   12,145.17x = 101,360,109.78
5. Step 5: Solve for x
   x = 101,360,109.78/12,145.17
6. Step 6: Final answer
   x = 8,345.71