Finding the Fourth Proportional to 1,245.60, 1,718.55 and 748.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,245.60 : 1,718.55 = 748.35 : x
2. Step 2: Convert to fraction form
   1,245.60/1,718.55 = 748.35/x
3. Step 3: Cross multiply
   1,245.60x = 1,718.55 × 748.35
4. Step 4: Simplify right side
   1,245.60x = 1,286,076.89
5. Step 5: Solve for x
   x = 1,286,076.89/1,245.60
6. Step 6: Final answer
   x = 1,032.50