Finding the Fourth Proportional to 12,948.20, 17,870.18 and 8,756.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,948.20 : 17,870.18 = 8,756.20 : x
2. Step 2: Convert to fraction form
   12,948.20/17,870.18 = 8,756.20/x
3. Step 3: Cross multiply
   12,948.20x = 17,870.18 × 8,756.20
4. Step 4: Simplify right side
   12,948.20x = 156,474,870.12
5. Step 5: Solve for x
   x = 156,474,870.12/12,948.20
6. Step 6: Final answer
   x = 12,084.68