Finding the Fourth Proportional to 1,434.18, 1,978.98 and 813.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.18 : 1,978.98 = 813.18 : x
2. Step 2: Convert to fraction form
   1,434.18/1,978.98 = 813.18/x
3. Step 3: Cross multiply
   1,434.18x = 1,978.98 × 813.18
4. Step 4: Simplify right side
   1,434.18x = 1,609,266.96
5. Step 5: Solve for x
   x = 1,609,266.96/1,434.18
6. Step 6: Final answer
   x = 1,122.08