Finding the Fourth Proportional to 1,929.94, 2,663.93 and 1,231.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,929.94 : 2,663.93 = 1,231.31 : x
2. Step 2: Convert to fraction form
   1,929.94/2,663.93 = 1,231.31/x
3. Step 3: Cross multiply
   1,929.94x = 2,663.93 × 1,231.31
4. Step 4: Simplify right side
   1,929.94x = 3,280,124.15
5. Step 5: Solve for x
   x = 3,280,124.15/1,929.94
6. Step 6: Final answer
   x = 1,699.60