Finding the Fourth Proportional to 1,007.57, 1,510.43 and 699.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.57 : 1,510.43 = 699.57 : x
2. Step 2: Convert to fraction form
   1,007.57/1,510.43 = 699.57/x
3. Step 3: Cross multiply
   1,007.57x = 1,510.43 × 699.57
4. Step 4: Simplify right side
   1,007.57x = 1,056,651.52
5. Step 5: Solve for x
   x = 1,056,651.52/1,007.57
6. Step 6: Final answer
   x = 1,048.71