Finding the Fourth Proportional to 13,307.57, 18,367.98 and 7,861.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,307.57 : 18,367.98 = 7,861.42 : x
2. Step 2: Convert to fraction form
   13,307.57/18,367.98 = 7,861.42/x
3. Step 3: Cross multiply
   13,307.57x = 18,367.98 × 7,861.42
4. Step 4: Simplify right side
   13,307.57x = 144,398,405.33
5. Step 5: Solve for x
   x = 144,398,405.33/13,307.57
6. Step 6: Final answer
   x = 10,850.85