Finding the Fourth Proportional to 1,007.10, 1,510.59 and 276.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.10 : 1,510.59 = 276.72 : x
2. Step 2: Convert to fraction form
   1,007.10/1,510.59 = 276.72/x
3. Step 3: Cross multiply
   1,007.10x = 1,510.59 × 276.72
4. Step 4: Simplify right side
   1,007.10x = 418,010.46
5. Step 5: Solve for x
   x = 418,010.46/1,007.10
6. Step 6: Final answer
   x = 415.06