Finding the Fourth Proportional to 1,929.78, 2,662.47 and 1,231.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,929.78 : 2,662.47 = 1,231.02 : x
2. Step 2: Convert to fraction form
   1,929.78/2,662.47 = 1,231.02/x
3. Step 3: Cross multiply
   1,929.78x = 2,662.47 × 1,231.02
4. Step 4: Simplify right side
   1,929.78x = 3,277,553.82
5. Step 5: Solve for x
   x = 3,277,553.82/1,929.78
6. Step 6: Final answer
   x = 1,698.41