Finding the Fourth Proportional to 1,286.01, 1,774.50 and 813.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,286.01 : 1,774.50 = 813.69 : x
2. Step 2: Convert to fraction form
   1,286.01/1,774.50 = 813.69/x
3. Step 3: Cross multiply
   1,286.01x = 1,774.50 × 813.69
4. Step 4: Simplify right side
   1,286.01x = 1,443,892.91
5. Step 5: Solve for x
   x = 1,443,892.91/1,286.01
6. Step 6: Final answer
   x = 1,122.77