Finding the Fourth Proportional to 2,148.86, 3,223.69 and 688.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,148.86 : 3,223.69 = 688.38 : x
2. Step 2: Convert to fraction form
   2,148.86/3,223.69 = 688.38/x
3. Step 3: Cross multiply
   2,148.86x = 3,223.69 × 688.38
4. Step 4: Simplify right side
   2,148.86x = 2,219,123.72
5. Step 5: Solve for x
   x = 2,219,123.72/2,148.86
6. Step 6: Final answer
   x = 1,032.70