Finding the Fourth Proportional to 2,199.52, 3,291.60 and 2,128.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,199.52 : 3,291.60 = 2,128.48 : x
2. Step 2: Convert to fraction form
   2,199.52/3,291.60 = 2,128.48/x
3. Step 3: Cross multiply
   2,199.52x = 3,291.60 × 2,128.48
4. Step 4: Simplify right side
   2,199.52x = 7,006,104.77
5. Step 5: Solve for x
   x = 7,006,104.77/2,199.52
6. Step 6: Final answer
   x = 3,185.29