Finding the Fourth Proportional to 2,167.68, 2,991.86 and 1,381.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.68 : 2,991.86 = 1,381.56 : x
2. Step 2: Convert to fraction form
   2,167.68/2,991.86 = 1,381.56/x
3. Step 3: Cross multiply
   2,167.68x = 2,991.86 × 1,381.56
4. Step 4: Simplify right side
   2,167.68x = 4,133,434.10
5. Step 5: Solve for x
   x = 4,133,434.10/2,167.68
6. Step 6: Final answer
   x = 1,906.85