Finding the Fourth Proportional to 12,861.22, 17,748.20 and 7,118.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,861.22 : 17,748.20 = 7,118.50 : x
2. Step 2: Convert to fraction form
   12,861.22/17,748.20 = 7,118.50/x
3. Step 3: Cross multiply
   12,861.22x = 17,748.20 × 7,118.50
4. Step 4: Simplify right side
   12,861.22x = 126,340,561.70
5. Step 5: Solve for x
   x = 126,340,561.70/12,861.22
6. Step 6: Final answer
   x = 9,823.37