Finding the Fourth Proportional to 12,084.42, 18,128.13 and 4,293.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,084.42 : 18,128.13 = 4,293.30 : x
2. Step 2: Convert to fraction form
   12,084.42/18,128.13 = 4,293.30/x
3. Step 3: Cross multiply
   12,084.42x = 18,128.13 × 4,293.30
4. Step 4: Simplify right side
   12,084.42x = 77,829,500.53
5. Step 5: Solve for x
   x = 77,829,500.53/12,084.42
6. Step 6: Final answer
   x = 6,440.48