Finding the Fourth Proportional to 12,084.18, 18,128.10 and 5,510.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,084.18 : 18,128.10 = 5,510.40 : x
2. Step 2: Convert to fraction form
   12,084.18/18,128.10 = 5,510.40/x
3. Step 3: Cross multiply
   12,084.18x = 18,128.10 × 5,510.40
4. Step 4: Simplify right side
   12,084.18x = 99,893,082.24
5. Step 5: Solve for x
   x = 99,893,082.24/12,084.18
6. Step 6: Final answer
   x = 8,266.43