Finding the Fourth Proportional to 1,287.56, 1,931.34 and 1,015.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.56 : 1,931.34 = 1,015.10 : x
2. Step 2: Convert to fraction form
   1,287.56/1,931.34 = 1,015.10/x
3. Step 3: Cross multiply
   1,287.56x = 1,931.34 × 1,015.10
4. Step 4: Simplify right side
   1,287.56x = 1,960,493.58
5. Step 5: Solve for x
   x = 1,960,493.58/1,287.56
6. Step 6: Final answer
   x = 1,522.65