Finding the Fourth Proportional to 14,613.21, 21,916.98 and 3,939.57

Step by Step Solution

1. Step 1: Write the proportion equation
   14,613.21 : 21,916.98 = 3,939.57 : x
2. Step 2: Convert to fraction form
   14,613.21/21,916.98 = 3,939.57/x
3. Step 3: Cross multiply
   14,613.21x = 21,916.98 × 3,939.57
4. Step 4: Simplify right side
   14,613.21x = 86,343,476.90
5. Step 5: Solve for x
   x = 86,343,476.90/14,613.21
6. Step 6: Final answer
   x = 5,908.59