Finding the Fourth Proportional to 12,145.56, 18,214.85 and 5,127.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,145.56 : 18,214.85 = 5,127.15 : x
2. Step 2: Convert to fraction form
   12,145.56/18,214.85 = 5,127.15/x
3. Step 3: Cross multiply
   12,145.56x = 18,214.85 × 5,127.15
4. Step 4: Simplify right side
   12,145.56x = 93,390,242.54
5. Step 5: Solve for x
   x = 93,390,242.54/12,145.56
6. Step 6: Final answer
   x = 7,689.25