Finding the Fourth Proportional to 1,162.15, 1,603.74 and 631.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.15 : 1,603.74 = 631.01 : x
2. Step 2: Convert to fraction form
   1,162.15/1,603.74 = 631.01/x
3. Step 3: Cross multiply
   1,162.15x = 1,603.74 × 631.01
4. Step 4: Simplify right side
   1,162.15x = 1,011,978.80
5. Step 5: Solve for x
   x = 1,011,978.80/1,162.15
6. Step 6: Final answer
   x = 870.78