Finding the Fourth Proportional to 1,920.61, 2,649.61 and 1,174.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,920.61 : 2,649.61 = 1,174.60 : x
2. Step 2: Convert to fraction form
   1,920.61/2,649.61 = 1,174.60/x
3. Step 3: Cross multiply
   1,920.61x = 2,649.61 × 1,174.60
4. Step 4: Simplify right side
   1,920.61x = 3,112,231.91
5. Step 5: Solve for x
   x = 3,112,231.91/1,920.61
6. Step 6: Final answer
   x = 1,620.44