Finding the Fourth Proportional to 1,442.94, 1,991.30 and 813.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.94 : 1,991.30 = 813.48 : x
2. Step 2: Convert to fraction form
   1,442.94/1,991.30 = 813.48/x
3. Step 3: Cross multiply
   1,442.94x = 1,991.30 × 813.48
4. Step 4: Simplify right side
   1,442.94x = 1,619,882.72
5. Step 5: Solve for x
   x = 1,619,882.72/1,442.94
6. Step 6: Final answer
   x = 1,122.63