Finding the Fourth Proportional to 2,139.23, 3,208.29 and 906.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.23 : 3,208.29 = 906.01 : x
2. Step 2: Convert to fraction form
   2,139.23/3,208.29 = 906.01/x
3. Step 3: Cross multiply
   2,139.23x = 3,208.29 × 906.01
4. Step 4: Simplify right side
   2,139.23x = 2,906,722.25
5. Step 5: Solve for x
   x = 2,906,722.25/2,139.23
6. Step 6: Final answer
   x = 1,358.77