Finding the Fourth Proportional to 12,222.31, 18,330.53 and 5,642.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,222.31 : 18,330.53 = 5,642.18 : x
2. Step 2: Convert to fraction form
   12,222.31/18,330.53 = 5,642.18/x
3. Step 3: Cross multiply
   12,222.31x = 18,330.53 × 5,642.18
4. Step 4: Simplify right side
   12,222.31x = 103,424,044.00
5. Step 5: Solve for x
   x = 103,424,044.00/12,222.31
6. Step 6: Final answer
   x = 8,461.91