Finding the Fourth Proportional to 1,118.43, 1,678.12 and 598.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.43 : 1,678.12 = 598.30 : x
2. Step 2: Convert to fraction form
   1,118.43/1,678.12 = 598.30/x
3. Step 3: Cross multiply
   1,118.43x = 1,678.12 × 598.30
4. Step 4: Simplify right side
   1,118.43x = 1,004,010.81
5. Step 5: Solve for x
   x = 1,004,010.81/1,118.43
6. Step 6: Final answer
   x = 897.70