Finding the Fourth Proportional to 2,153.31, 3,223.58 and 1,328.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.31 : 3,223.58 = 1,328.93 : x
2. Step 2: Convert to fraction form
   2,153.31/3,223.58 = 1,328.93/x
3. Step 3: Cross multiply
   2,153.31x = 3,223.58 × 1,328.93
4. Step 4: Simplify right side
   2,153.31x = 4,283,912.17
5. Step 5: Solve for x
   x = 4,283,912.17/2,153.31
6. Step 6: Final answer
   x = 1,989.45