Finding the Fourth Proportional to 1,391.58, 2,085.98 and 696.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.58 : 2,085.98 = 696.12 : x
2. Step 2: Convert to fraction form
   1,391.58/2,085.98 = 696.12/x
3. Step 3: Cross multiply
   1,391.58x = 2,085.98 × 696.12
4. Step 4: Simplify right side
   1,391.58x = 1,452,094.79
5. Step 5: Solve for x
   x = 1,452,094.79/1,391.58
6. Step 6: Final answer
   x = 1,043.49