Finding the Fourth Proportional to 1,009.06, 1,391.98 and 635.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.06 : 1,391.98 = 635.34 : x
2. Step 2: Convert to fraction form
   1,009.06/1,391.98 = 635.34/x
3. Step 3: Cross multiply
   1,009.06x = 1,391.98 × 635.34
4. Step 4: Simplify right side
   1,009.06x = 884,380.57
5. Step 5: Solve for x
   x = 884,380.57/1,009.06
6. Step 6: Final answer
   x = 876.44