Finding the Fourth Proportional to 1,041.89, 1,436.81 and 638.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,041.89 : 1,436.81 = 638.01 : x
2. Step 2: Convert to fraction form
   1,041.89/1,436.81 = 638.01/x
3. Step 3: Cross multiply
   1,041.89x = 1,436.81 × 638.01
4. Step 4: Simplify right side
   1,041.89x = 916,695.96
5. Step 5: Solve for x
   x = 916,695.96/1,041.89
6. Step 6: Final answer
   x = 879.84