Finding the Fourth Proportional to 1,229.31, 1,692.50 and 1,146.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,229.31 : 1,692.50 = 1,146.69 : x
2. Step 2: Convert to fraction form
   1,229.31/1,692.50 = 1,146.69/x
3. Step 3: Cross multiply
   1,229.31x = 1,692.50 × 1,146.69
4. Step 4: Simplify right side
   1,229.31x = 1,940,767.09
5. Step 5: Solve for x
   x = 1,940,767.09/1,229.31
6. Step 6: Final answer
   x = 1,578.75