Finding the Fourth Proportional to 1,018.76, 1,405.89 and 553.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.76 : 1,405.89 = 553.01 : x
2. Step 2: Convert to fraction form
   1,018.76/1,405.89 = 553.01/x
3. Step 3: Cross multiply
   1,018.76x = 1,405.89 × 553.01
4. Step 4: Simplify right side
   1,018.76x = 777,464.20
5. Step 5: Solve for x
   x = 777,464.20/1,018.76
6. Step 6: Final answer
   x = 763.15