Finding the Fourth Proportional to 1,816.32, 2,720.52 and 1,328.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,816.32 : 2,720.52 = 1,328.28 : x
2. Step 2: Convert to fraction form
   1,816.32/2,720.52 = 1,328.28/x
3. Step 3: Cross multiply
   1,816.32x = 2,720.52 × 1,328.28
4. Step 4: Simplify right side
   1,816.32x = 3,613,612.31
5. Step 5: Solve for x
   x = 3,613,612.31/1,816.32
6. Step 6: Final answer
   x = 1,989.52