Finding the Fourth Proportional to 1,421.74, 1,961.55 and 800.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.74 : 1,961.55 = 800.62 : x
2. Step 2: Convert to fraction form
   1,421.74/1,961.55 = 800.62/x
3. Step 3: Cross multiply
   1,421.74x = 1,961.55 × 800.62
4. Step 4: Simplify right side
   1,421.74x = 1,570,456.16
5. Step 5: Solve for x
   x = 1,570,456.16/1,421.74
6. Step 6: Final answer
   x = 1,104.60