Finding the Fourth Proportional to 2,130.51, 3,196.23 and 669.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,130.51 : 3,196.23 = 669.78 : x
2. Step 2: Convert to fraction form
   2,130.51/3,196.23 = 669.78/x
3. Step 3: Cross multiply
   2,130.51x = 3,196.23 × 669.78
4. Step 4: Simplify right side
   2,130.51x = 2,140,768.42
5. Step 5: Solve for x
   x = 2,140,768.42/2,130.51
6. Step 6: Final answer
   x = 1,004.81