Finding the Fourth Proportional to 1,098.83, 1,648.83 and 612.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.83 : 1,648.83 = 612.29 : x
2. Step 2: Convert to fraction form
   1,098.83/1,648.83 = 612.29/x
3. Step 3: Cross multiply
   1,098.83x = 1,648.83 × 612.29
4. Step 4: Simplify right side
   1,098.83x = 1,009,562.12
5. Step 5: Solve for x
   x = 1,009,562.12/1,098.83
6. Step 6: Final answer
   x = 918.76