Finding the Fourth Proportional to 1,085.01, 1,497.33 and 642.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.01 : 1,497.33 = 642.96 : x
2. Step 2: Convert to fraction form
   1,085.01/1,497.33 = 642.96/x
3. Step 3: Cross multiply
   1,085.01x = 1,497.33 × 642.96
4. Step 4: Simplify right side
   1,085.01x = 962,723.30
5. Step 5: Solve for x
   x = 962,723.30/1,085.01
6. Step 6: Final answer
   x = 887.29