Finding the Fourth Proportional to 2,139.33, 2,950.42 and 1,393.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.33 : 2,950.42 = 1,393.02 : x
2. Step 2: Convert to fraction form
   2,139.33/2,950.42 = 1,393.02/x
3. Step 3: Cross multiply
   2,139.33x = 2,950.42 × 1,393.02
4. Step 4: Simplify right side
   2,139.33x = 4,109,994.07
5. Step 5: Solve for x
   x = 4,109,994.07/2,139.33
6. Step 6: Final answer
   x = 1,921.16