Finding the Fourth Proportional to 1,665.98, 2,495.21 and 800.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.98 : 2,495.21 = 800.94 : x
2. Step 2: Convert to fraction form
   1,665.98/2,495.21 = 800.94/x
3. Step 3: Cross multiply
   1,665.98x = 2,495.21 × 800.94
4. Step 4: Simplify right side
   1,665.98x = 1,998,513.50
5. Step 5: Solve for x
   x = 1,998,513.50/1,665.98
6. Step 6: Final answer
   x = 1,199.60