Finding the Fourth Proportional to 1,542.51, 2,128.67 and 843.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,542.51 : 2,128.67 = 843.89 : x
2. Step 2: Convert to fraction form
   1,542.51/2,128.67 = 843.89/x
3. Step 3: Cross multiply
   1,542.51x = 2,128.67 × 843.89
4. Step 4: Simplify right side
   1,542.51x = 1,796,348.46
5. Step 5: Solve for x
   x = 1,796,348.46/1,542.51
6. Step 6: Final answer
   x = 1,164.56