Finding the Fourth Proportional to 1,225.16, 1,690.72 and 701.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225.16 : 1,690.72 = 701.20 : x
2. Step 2: Convert to fraction form
   1,225.16/1,690.72 = 701.20/x
3. Step 3: Cross multiply
   1,225.16x = 1,690.72 × 701.20
4. Step 4: Simplify right side
   1,225.16x = 1,185,532.86
5. Step 5: Solve for x
   x = 1,185,532.86/1,225.16
6. Step 6: Final answer
   x = 967.66