Finding the Fourth Proportional to 1,007.01, 1,389.33 and 633.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.01 : 1,389.33 = 633.85 : x
2. Step 2: Convert to fraction form
   1,007.01/1,389.33 = 633.85/x
3. Step 3: Cross multiply
   1,007.01x = 1,389.33 × 633.85
4. Step 4: Simplify right side
   1,007.01x = 880,631.33
5. Step 5: Solve for x
   x = 880,631.33/1,007.01
6. Step 6: Final answer
   x = 874.50