Finding the Fourth Proportional to 2,660.42, 3,990.90 and 1,018.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,660.42 : 3,990.90 = 1,018.34 : x
2. Step 2: Convert to fraction form
   2,660.42/3,990.90 = 1,018.34/x
3. Step 3: Cross multiply
   2,660.42x = 3,990.90 × 1,018.34
4. Step 4: Simplify right side
   2,660.42x = 4,064,088.01
5. Step 5: Solve for x
   x = 4,064,088.01/2,660.42
6. Step 6: Final answer
   x = 1,527.61