Finding the Fourth Proportional to 12,868.46, 17,766.50 and 9,878.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,868.46 : 17,766.50 = 9,878.34 : x
2. Step 2: Convert to fraction form
   12,868.46/17,766.50 = 9,878.34/x
3. Step 3: Cross multiply
   12,868.46x = 17,766.50 × 9,878.34
4. Step 4: Simplify right side
   12,868.46x = 175,503,527.61
5. Step 5: Solve for x
   x = 175,503,527.61/12,868.46
6. Step 6: Final answer
   x = 13,638.27