Finding the Fourth Proportional to 1,510.05, 2,086.17 and 1,207.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,510.05 : 2,086.17 = 1,207.87 : x
2. Step 2: Convert to fraction form
   1,510.05/2,086.17 = 1,207.87/x
3. Step 3: Cross multiply
   1,510.05x = 2,086.17 × 1,207.87
4. Step 4: Simplify right side
   1,510.05x = 2,519,816.94
5. Step 5: Solve for x
   x = 2,519,816.94/1,510.05
6. Step 6: Final answer
   x = 1,668.70