Finding the Fourth Proportional to 1,212.42, 1,816.89 and 691.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212.42 : 1,816.89 = 691.34 : x
2. Step 2: Convert to fraction form
   1,212.42/1,816.89 = 691.34/x
3. Step 3: Cross multiply
   1,212.42x = 1,816.89 × 691.34
4. Step 4: Simplify right side
   1,212.42x = 1,256,088.73
5. Step 5: Solve for x
   x = 1,256,088.73/1,212.42
6. Step 6: Final answer
   x = 1,036.02