Finding the Fourth Proportional to 2,128.22, 3,191.43 and 1,569.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.22 : 3,191.43 = 1,569.55 : x
2. Step 2: Convert to fraction form
   2,128.22/3,191.43 = 1,569.55/x
3. Step 3: Cross multiply
   2,128.22x = 3,191.43 × 1,569.55
4. Step 4: Simplify right side
   2,128.22x = 5,009,108.58
5. Step 5: Solve for x
   x = 5,009,108.58/2,128.22
6. Step 6: Final answer
   x = 2,353.66