Finding the Fourth Proportional to 2,239.61, 3,357.59 and 1,128.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,239.61 : 3,357.59 = 1,128.29 : x
2. Step 2: Convert to fraction form
   2,239.61/3,357.59 = 1,128.29/x
3. Step 3: Cross multiply
   2,239.61x = 3,357.59 × 1,128.29
4. Step 4: Simplify right side
   2,239.61x = 3,788,312.79
5. Step 5: Solve for x
   x = 3,788,312.79/2,239.61
6. Step 6: Final answer
   x = 1,691.51