Finding the Fourth Proportional to 1,057.84, 1,459.46 and 638.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.84 : 1,459.46 = 638.03 : x
2. Step 2: Convert to fraction form
   1,057.84/1,459.46 = 638.03/x
3. Step 3: Cross multiply
   1,057.84x = 1,459.46 × 638.03
4. Step 4: Simplify right side
   1,057.84x = 931,176.07
5. Step 5: Solve for x
   x = 931,176.07/1,057.84
6. Step 6: Final answer
   x = 880.27