Finding the Fourth Proportional to 9,128.32, 12,590.60 and 8,823.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128.32 : 12,590.60 = 8,823.48 : x
2. Step 2: Convert to fraction form
   9,128.32/12,590.60 = 8,823.48/x
3. Step 3: Cross multiply
   9,128.32x = 12,590.60 × 8,823.48
4. Step 4: Simplify right side
   9,128.32x = 111,092,907.29
5. Step 5: Solve for x
   x = 111,092,907.29/9,128.32
6. Step 6: Final answer
   x = 12,170.14