Finding the Fourth Proportional to 12,242.90, 18,352.71 and 3,917.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,242.90 : 18,352.71 = 3,917.55 : x
2. Step 2: Convert to fraction form
   12,242.90/18,352.71 = 3,917.55/x
3. Step 3: Cross multiply
   12,242.90x = 18,352.71 × 3,917.55
4. Step 4: Simplify right side
   12,242.90x = 71,897,659.06
5. Step 5: Solve for x
   x = 71,897,659.06/12,242.90
6. Step 6: Final answer
   x = 5,872.60