Finding the Fourth Proportional to 9,702.18, 14,555.28 and 3,128.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,702.18 : 14,555.28 = 3,128.10 : x
2. Step 2: Convert to fraction form
   9,702.18/14,555.28 = 3,128.10/x
3. Step 3: Cross multiply
   9,702.18x = 14,555.28 × 3,128.10
4. Step 4: Simplify right side
   9,702.18x = 45,530,371.37
5. Step 5: Solve for x
   x = 45,530,371.37/9,702.18
6. Step 6: Final answer
   x = 4,692.80