Finding the Fourth Proportional to 2,139.94, 3,210.33 and 907.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.94 : 3,210.33 = 907.33 : x
2. Step 2: Convert to fraction form
   2,139.94/3,210.33 = 907.33/x
3. Step 3: Cross multiply
   2,139.94x = 3,210.33 × 907.33
4. Step 4: Simplify right side
   2,139.94x = 2,912,828.72
5. Step 5: Solve for x
   x = 2,912,828.72/2,139.94
6. Step 6: Final answer
   x = 1,361.17