Finding the Fourth Proportional to 1,120.50, 1,669.61 and 997.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.50 : 1,669.61 = 997.82 : x
2. Step 2: Convert to fraction form
   1,120.50/1,669.61 = 997.82/x
3. Step 3: Cross multiply
   1,120.50x = 1,669.61 × 997.82
4. Step 4: Simplify right side
   1,120.50x = 1,665,970.66
5. Step 5: Solve for x
   x = 1,665,970.66/1,120.50
6. Step 6: Final answer
   x = 1,486.81