Finding the Fourth Proportional to 1,007.06, 1,510.43 and 276.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.06 : 1,510.43 = 276.69 : x
2. Step 2: Convert to fraction form
   1,007.06/1,510.43 = 276.69/x
3. Step 3: Cross multiply
   1,007.06x = 1,510.43 × 276.69
4. Step 4: Simplify right side
   1,007.06x = 417,920.88
5. Step 5: Solve for x
   x = 417,920.88/1,007.06
6. Step 6: Final answer
   x = 414.99