Finding the Fourth Proportional to 1,035.83, 1,429.36 and 642.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,035.83 : 1,429.36 = 642.77 : x
2. Step 2: Convert to fraction form
   1,035.83/1,429.36 = 642.77/x
3. Step 3: Cross multiply
   1,035.83x = 1,429.36 × 642.77
4. Step 4: Simplify right side
   1,035.83x = 918,751.69
5. Step 5: Solve for x
   x = 918,751.69/1,035.83
6. Step 6: Final answer
   x = 886.98