Finding the Fourth Proportional to 1,018.78, 1,405.98 and 576.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.78 : 1,405.98 = 576.70 : x
2. Step 2: Convert to fraction form
   1,018.78/1,405.98 = 576.70/x
3. Step 3: Cross multiply
   1,018.78x = 1,405.98 × 576.70
4. Step 4: Simplify right side
   1,018.78x = 810,828.67
5. Step 5: Solve for x
   x = 810,828.67/1,018.78
6. Step 6: Final answer
   x = 795.88