Finding the Fourth Proportional to 1,337.28, 1,843.62 and 1,128.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,337.28 : 1,843.62 = 1,128.30 : x
2. Step 2: Convert to fraction form
   1,337.28/1,843.62 = 1,128.30/x
3. Step 3: Cross multiply
   1,337.28x = 1,843.62 × 1,128.30
4. Step 4: Simplify right side
   1,337.28x = 2,080,156.45
5. Step 5: Solve for x
   x = 2,080,156.45/1,337.28
6. Step 6: Final answer
   x = 1,555.51