Finding the Fourth Proportional to 1,421.50, 1,961.75 and 800.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.50 : 1,961.75 = 800.54 : x
2. Step 2: Convert to fraction form
   1,421.50/1,961.75 = 800.54/x
3. Step 3: Cross multiply
   1,421.50x = 1,961.75 × 800.54
4. Step 4: Simplify right side
   1,421.50x = 1,570,459.35
5. Step 5: Solve for x
   x = 1,570,459.35/1,421.50
6. Step 6: Final answer
   x = 1,104.79