Finding the Fourth Proportional to 12,673.20, 17,123.40 and 12,673.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,673.20 : 17,123.40 = 12,673.20 : x
2. Step 2: Convert to fraction form
   12,673.20/17,123.40 = 12,673.20/x
3. Step 3: Cross multiply
   12,673.20x = 17,123.40 × 12,673.20
4. Step 4: Simplify right side
   12,673.20x = 217,008,272.88
5. Step 5: Solve for x
   x = 217,008,272.88/12,673.20
6. Step 6: Final answer
   x = 17,123.40