Finding the Fourth Proportional to 5,123.43, 7,686.17 and 1,836.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.43 : 7,686.17 = 1,836.78 : x
2. Step 2: Convert to fraction form
   5,123.43/7,686.17 = 1,836.78/x
3. Step 3: Cross multiply
   5,123.43x = 7,686.17 × 1,836.78
4. Step 4: Simplify right side
   5,123.43x = 14,117,767.05
5. Step 5: Solve for x
   x = 14,117,767.05/5,123.43
6. Step 6: Final answer
   x = 2,755.53