Finding the Fourth Proportional to 9,820.64, 14,702.72 and 9,128.65

Step by Step Solution

1. Step 1: Write the proportion equation
   9,820.64 : 14,702.72 = 9,128.65 : x
2. Step 2: Convert to fraction form
   9,820.64/14,702.72 = 9,128.65/x
3. Step 3: Cross multiply
   9,820.64x = 14,702.72 × 9,128.65
4. Step 4: Simplify right side
   9,820.64x = 134,215,930.10
5. Step 5: Solve for x
   x = 134,215,930.10/9,820.64
6. Step 6: Final answer
   x = 13,666.72