Finding the Fourth Proportional to 1,778.42, 2,665.23 and 1,128.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,778.42 : 2,665.23 = 1,128.02 : x
2. Step 2: Convert to fraction form
   1,778.42/2,665.23 = 1,128.02/x
3. Step 3: Cross multiply
   1,778.42x = 2,665.23 × 1,128.02
4. Step 4: Simplify right side
   1,778.42x = 3,006,432.74
5. Step 5: Solve for x
   x = 3,006,432.74/1,778.42
6. Step 6: Final answer
   x = 1,690.51