Finding the Fourth Proportional to 2,153.32, 3,225.42 and 1,228.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.32 : 3,225.42 = 1,228.40 : x
2. Step 2: Convert to fraction form
   2,153.32/3,225.42 = 1,228.40/x
3. Step 3: Cross multiply
   2,153.32x = 3,225.42 × 1,228.40
4. Step 4: Simplify right side
   2,153.32x = 3,962,101.90
5. Step 5: Solve for x
   x = 3,962,101.90/2,153.32
6. Step 6: Final answer
   x = 1,840.00