Finding the Fourth Proportional to 1,018.83, 1,405.98 and 553.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.83 : 1,405.98 = 553.08 : x
2. Step 2: Convert to fraction form
   1,018.83/1,405.98 = 553.08/x
3. Step 3: Cross multiply
   1,018.83x = 1,405.98 × 553.08
4. Step 4: Simplify right side
   1,018.83x = 777,618.34
5. Step 5: Solve for x
   x = 777,618.34/1,018.83
6. Step 6: Final answer
   x = 763.25