Finding the Fourth Proportional to 1,442.95, 1,991.25 and 813.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.95 : 1,991.25 = 813.48 : x
2. Step 2: Convert to fraction form
   1,442.95/1,991.25 = 813.48/x
3. Step 3: Cross multiply
   1,442.95x = 1,991.25 × 813.48
4. Step 4: Simplify right side
   1,442.95x = 1,619,835.27
5. Step 5: Solve for x
   x = 1,619,835.27/1,442.95
6. Step 6: Final answer
   x = 1,122.59