Finding the Fourth Proportional to 1,688.25, 2,330.06 and 1,223.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,688.25 : 2,330.06 = 1,223.31 : x
2. Step 2: Convert to fraction form
   1,688.25/2,330.06 = 1,223.31/x
3. Step 3: Cross multiply
   1,688.25x = 2,330.06 × 1,223.31
4. Step 4: Simplify right side
   1,688.25x = 2,850,379.58
5. Step 5: Solve for x
   x = 2,850,379.58/1,688.25
6. Step 6: Final answer
   x = 1,688.36