Finding the Fourth Proportional to 2,002.10, 3,003.12 and 905.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,002.10 : 3,003.12 = 905.70 : x
2. Step 2: Convert to fraction form
   2,002.10/3,003.12 = 905.70/x
3. Step 3: Cross multiply
   2,002.10x = 3,003.12 × 905.70
4. Step 4: Simplify right side
   2,002.10x = 2,719,925.78
5. Step 5: Solve for x
   x = 2,719,925.78/2,002.10
6. Step 6: Final answer
   x = 1,358.54