Finding the Fourth Proportional to 1,359.68, 2,036.89 and 812.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.68 : 2,036.89 = 812.30 : x
2. Step 2: Convert to fraction form
   1,359.68/2,036.89 = 812.30/x
3. Step 3: Cross multiply
   1,359.68x = 2,036.89 × 812.30
4. Step 4: Simplify right side
   1,359.68x = 1,654,565.75
5. Step 5: Solve for x
   x = 1,654,565.75/1,359.68
6. Step 6: Final answer
   x = 1,216.88