Finding the Fourth Proportional to 1,541.67, 2,128.46 and 1,223.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,541.67 : 2,128.46 = 1,223.93 : x
2. Step 2: Convert to fraction form
   1,541.67/2,128.46 = 1,223.93/x
3. Step 3: Cross multiply
   1,541.67x = 2,128.46 × 1,223.93
4. Step 4: Simplify right side
   1,541.67x = 2,605,086.05
5. Step 5: Solve for x
   x = 2,605,086.05/1,541.67
6. Step 6: Final answer
   x = 1,689.79