Finding the Fourth Proportional to 1,390.96, 2,085.33 and 697.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.96 : 2,085.33 = 697.25 : x
2. Step 2: Convert to fraction form
   1,390.96/2,085.33 = 697.25/x
3. Step 3: Cross multiply
   1,390.96x = 2,085.33 × 697.25
4. Step 4: Simplify right side
   1,390.96x = 1,454,004.17
5. Step 5: Solve for x
   x = 1,454,004.17/1,390.96
6. Step 6: Final answer
   x = 1,045.32