Finding the Fourth Proportional to 1,162.84, 1,604.72 and 638.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.84 : 1,604.72 = 638.88 : x
2. Step 2: Convert to fraction form
   1,162.84/1,604.72 = 638.88/x
3. Step 3: Cross multiply
   1,162.84x = 1,604.72 × 638.88
4. Step 4: Simplify right side
   1,162.84x = 1,025,223.51
5. Step 5: Solve for x
   x = 1,025,223.51/1,162.84
6. Step 6: Final answer
   x = 881.65