Finding the Fourth Proportional to 1,510.12, 2,261.34 and 859.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,510.12 : 2,261.34 = 859.72 : x
2. Step 2: Convert to fraction form
   1,510.12/2,261.34 = 859.72/x
3. Step 3: Cross multiply
   1,510.12x = 2,261.34 × 859.72
4. Step 4: Simplify right side
   1,510.12x = 1,944,119.22
5. Step 5: Solve for x
   x = 1,944,119.22/1,510.12
6. Step 6: Final answer
   x = 1,287.39