Finding the Fourth Proportional to 1,320.56, 1,984.72 and 637.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.56 : 1,984.72 = 637.04 : x
2. Step 2: Convert to fraction form
   1,320.56/1,984.72 = 637.04/x
3. Step 3: Cross multiply
   1,320.56x = 1,984.72 × 637.04
4. Step 4: Simplify right side
   1,320.56x = 1,264,346.03
5. Step 5: Solve for x
   x = 1,264,346.03/1,320.56
6. Step 6: Final answer
   x = 957.43