Finding the Fourth Proportional to 1,253.25, 1,729.61 and 693.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,253.25 : 1,729.61 = 693.80 : x
2. Step 2: Convert to fraction form
   1,253.25/1,729.61 = 693.80/x
3. Step 3: Cross multiply
   1,253.25x = 1,729.61 × 693.80
4. Step 4: Simplify right side
   1,253.25x = 1,199,991.30
5. Step 5: Solve for x
   x = 1,199,991.30/1,253.25
6. Step 6: Final answer
   x = 957.50