Finding the Fourth Proportional to 9,128, 12,595.88 and 5,590.64

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128 : 12,595.88 = 5,590.64 : x
2. Step 2: Convert to fraction form
   9,128/12,595.88 = 5,590.64/x
3. Step 3: Cross multiply
   9,128x = 12,595.88 × 5,590.64
4. Step 4: Simplify right side
   9,128x = 70,419,030.56
5. Step 5: Solve for x
   x = 70,419,030.56/9,128
6. Step 6: Final answer
   x = 7,714.62