Finding the Fourth Proportional to 2,071.12, 3,106.90 and 665.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.12 : 3,106.90 = 665.18 : x
2. Step 2: Convert to fraction form
   2,071.12/3,106.90 = 665.18/x
3. Step 3: Cross multiply
   2,071.12x = 3,106.90 × 665.18
4. Step 4: Simplify right side
   2,071.12x = 2,066,649.69
5. Step 5: Solve for x
   x = 2,066,649.69/2,071.12
6. Step 6: Final answer
   x = 997.84