Finding the Fourth Proportional to 3,123.78, 4,310.78 and 1,726.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,123.78 : 4,310.78 = 1,726.50 : x
2. Step 2: Convert to fraction form
   3,123.78/4,310.78 = 1,726.50/x
3. Step 3: Cross multiply
   3,123.78x = 4,310.78 × 1,726.50
4. Step 4: Simplify right side
   3,123.78x = 7,442,561.67
5. Step 5: Solve for x
   x = 7,442,561.67/3,123.78
6. Step 6: Final answer
   x = 2,382.55