Finding the Fourth Proportional to 1,018.50, 1,405.68 and 598.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.50 : 1,405.68 = 598.89 : x
2. Step 2: Convert to fraction form
   1,018.50/1,405.68 = 598.89/x
3. Step 3: Cross multiply
   1,018.50x = 1,405.68 × 598.89
4. Step 4: Simplify right side
   1,018.50x = 841,847.70
5. Step 5: Solve for x
   x = 841,847.70/1,018.50
6. Step 6: Final answer
   x = 826.56