Finding the Fourth Proportional to 1,920.42, 2,649.78 and 1,174.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,920.42 : 2,649.78 = 1,174.55 : x
2. Step 2: Convert to fraction form
   1,920.42/2,649.78 = 1,174.55/x
3. Step 3: Cross multiply
   1,920.42x = 2,649.78 × 1,174.55
4. Step 4: Simplify right side
   1,920.42x = 3,112,285.85
5. Step 5: Solve for x
   x = 3,112,285.85/1,920.42
6. Step 6: Final answer
   x = 1,620.63