Finding the Fourth Proportional to 1,162.58, 1,604.46 and 638.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.58 : 1,604.46 = 638.71 : x
2. Step 2: Convert to fraction form
   1,162.58/1,604.46 = 638.71/x
3. Step 3: Cross multiply
   1,162.58x = 1,604.46 × 638.71
4. Step 4: Simplify right side
   1,162.58x = 1,024,784.65
5. Step 5: Solve for x
   x = 1,024,784.65/1,162.58
6. Step 6: Final answer
   x = 881.47