Finding the Fourth Proportional to 1,098.74, 1,646.83 and 666.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.74 : 1,646.83 = 666.18 : x
2. Step 2: Convert to fraction form
   1,098.74/1,646.83 = 666.18/x
3. Step 3: Cross multiply
   1,098.74x = 1,646.83 × 666.18
4. Step 4: Simplify right side
   1,098.74x = 1,097,085.21
5. Step 5: Solve for x
   x = 1,097,085.21/1,098.74
6. Step 6: Final answer
   x = 998.49