Finding the Fourth Proportional to 1,426.91, 2,137.33 and 931.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.91 : 2,137.33 = 931.56 : x
2. Step 2: Convert to fraction form
   1,426.91/2,137.33 = 931.56/x
3. Step 3: Cross multiply
   1,426.91x = 2,137.33 × 931.56
4. Step 4: Simplify right side
   1,426.91x = 1,991,064.94
5. Step 5: Solve for x
   x = 1,991,064.94/1,426.91
6. Step 6: Final answer
   x = 1,395.37