Finding the Fourth Proportional to 1,315.77, 1,815.72 and 748.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.77 : 1,815.72 = 748.70 : x
2. Step 2: Convert to fraction form
   1,315.77/1,815.72 = 748.70/x
3. Step 3: Cross multiply
   1,315.77x = 1,815.72 × 748.70
4. Step 4: Simplify right side
   1,315.77x = 1,359,435.91
5. Step 5: Solve for x
   x = 1,359,435.91/1,315.77
6. Step 6: Final answer
   x = 1,033.19