Finding the Fourth Proportional to 1,086.39, 1,631.34 and 599.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.39 : 1,631.34 = 599.76 : x
2. Step 2: Convert to fraction form
   1,086.39/1,631.34 = 599.76/x
3. Step 3: Cross multiply
   1,086.39x = 1,631.34 × 599.76
4. Step 4: Simplify right side
   1,086.39x = 978,412.48
5. Step 5: Solve for x
   x = 978,412.48/1,086.39
6. Step 6: Final answer
   x = 900.61