Finding the Fourth Proportional to 2,221.83, 3,330.43 and 905.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,221.83 : 3,330.43 = 905.01 : x
2. Step 2: Convert to fraction form
   2,221.83/3,330.43 = 905.01/x
3. Step 3: Cross multiply
   2,221.83x = 3,330.43 × 905.01
4. Step 4: Simplify right side
   2,221.83x = 3,014,073.03
5. Step 5: Solve for x
   x = 3,014,073.03/2,221.83
6. Step 6: Final answer
   x = 1,356.57