Finding the Fourth Proportional to 1,365.32, 1,880.86 and 1,128.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,365.32 : 1,880.86 = 1,128.28 : x
2. Step 2: Convert to fraction form
   1,365.32/1,880.86 = 1,128.28/x
3. Step 3: Cross multiply
   1,365.32x = 1,880.86 × 1,128.28
4. Step 4: Simplify right side
   1,365.32x = 2,122,136.72
5. Step 5: Solve for x
   x = 2,122,136.72/1,365.32
6. Step 6: Final answer
   x = 1,554.31