Finding the Fourth Proportional to 1,597.50, 2,394.72 and 817.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,597.50 : 2,394.72 = 817.20 : x
2. Step 2: Convert to fraction form
   1,597.50/2,394.72 = 817.20/x
3. Step 3: Cross multiply
   1,597.50x = 2,394.72 × 817.20
4. Step 4: Simplify right side
   1,597.50x = 1,956,965.18
5. Step 5: Solve for x
   x = 1,956,965.18/1,597.50
6. Step 6: Final answer
   x = 1,225.02