Finding the Fourth Proportional to 1,009.20, 1,502.71 and 998.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.20 : 1,502.71 = 998.17 : x
2. Step 2: Convert to fraction form
   1,009.20/1,502.71 = 998.17/x
3. Step 3: Cross multiply
   1,009.20x = 1,502.71 × 998.17
4. Step 4: Simplify right side
   1,009.20x = 1,499,960.04
5. Step 5: Solve for x
   x = 1,499,960.04/1,009.20
6. Step 6: Final answer
   x = 1,486.29