Finding the Fourth Proportional to 2,001.30, 3,002.55 and 905.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,001.30 : 3,002.55 = 905.67 : x
2. Step 2: Convert to fraction form
   2,001.30/3,002.55 = 905.67/x
3. Step 3: Cross multiply
   2,001.30x = 3,002.55 × 905.67
4. Step 4: Simplify right side
   2,001.30x = 2,719,321.16
5. Step 5: Solve for x
   x = 2,719,321.16/2,001.30
6. Step 6: Final answer
   x = 1,358.78