Finding the Fourth Proportional to 1,315.89, 1,814.83 and 985.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.89 : 1,814.83 = 985.10 : x
2. Step 2: Convert to fraction form
   1,315.89/1,814.83 = 985.10/x
3. Step 3: Cross multiply
   1,315.89x = 1,814.83 × 985.10
4. Step 4: Simplify right side
   1,315.89x = 1,787,789.03
5. Step 5: Solve for x
   x = 1,787,789.03/1,315.89
6. Step 6: Final answer
   x = 1,358.62