Finding the Fourth Proportional to 12,210.40, 18,317.08 and 3,445.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,210.40 : 18,317.08 = 3,445.31 : x
2. Step 2: Convert to fraction form
   12,210.40/18,317.08 = 3,445.31/x
3. Step 3: Cross multiply
   12,210.40x = 18,317.08 × 3,445.31
4. Step 4: Simplify right side
   12,210.40x = 63,108,091.89
5. Step 5: Solve for x
   x = 63,108,091.89/12,210.40
6. Step 6: Final answer
   x = 5,168.39