Finding the Fourth Proportional to 1,920.31, 2,650.12 and 1,174.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,920.31 : 2,650.12 = 1,174.14 : x
2. Step 2: Convert to fraction form
   1,920.31/2,650.12 = 1,174.14/x
3. Step 3: Cross multiply
   1,920.31x = 2,650.12 × 1,174.14
4. Step 4: Simplify right side
   1,920.31x = 3,111,608.96
5. Step 5: Solve for x
   x = 3,111,608.96/1,920.31
6. Step 6: Final answer
   x = 1,620.37