Finding the Fourth Proportional to 12,928.76, 17,848.49 and 8,702.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,928.76 : 17,848.49 = 8,702.05 : x
2. Step 2: Convert to fraction form
   12,928.76/17,848.49 = 8,702.05/x
3. Step 3: Cross multiply
   12,928.76x = 17,848.49 × 8,702.05
4. Step 4: Simplify right side
   12,928.76x = 155,318,452.40
5. Step 5: Solve for x
   x = 155,318,452.40/12,928.76
6. Step 6: Final answer
   x = 12,013.41