Finding the Fourth Proportional to 2,117.78, 2,923.39 and 1,372.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.78 : 2,923.39 = 1,372.38 : x
2. Step 2: Convert to fraction form
   2,117.78/2,923.39 = 1,372.38/x
3. Step 3: Cross multiply
   2,117.78x = 2,923.39 × 1,372.38
4. Step 4: Simplify right side
   2,117.78x = 4,011,992.72
5. Step 5: Solve for x
   x = 4,011,992.72/2,117.78
6. Step 6: Final answer
   x = 1,894.43