Finding the Fourth Proportional to 1,035.46, 1,429.05 and 642.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,035.46 : 1,429.05 = 642.82 : x
2. Step 2: Convert to fraction form
   1,035.46/1,429.05 = 642.82/x
3. Step 3: Cross multiply
   1,035.46x = 1,429.05 × 642.82
4. Step 4: Simplify right side
   1,035.46x = 918,621.92
5. Step 5: Solve for x
   x = 918,621.92/1,035.46
6. Step 6: Final answer
   x = 887.16