Finding the Fourth Proportional to 2,139.52, 3,209.62 and 906.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.52 : 3,209.62 = 906.94 : x
2. Step 2: Convert to fraction form
   2,139.52/3,209.62 = 906.94/x
3. Step 3: Cross multiply
   2,139.52x = 3,209.62 × 906.94
4. Step 4: Simplify right side
   2,139.52x = 2,910,932.76
5. Step 5: Solve for x
   x = 2,910,932.76/2,139.52
6. Step 6: Final answer
   x = 1,360.55