Finding the Fourth Proportional to 12,139.60, 17,030 and 12,139.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,139.60 : 17,030 = 12,139.60 : x
2. Step 2: Convert to fraction form
   12,139.60/17,030 = 12,139.60/x
3. Step 3: Cross multiply
   12,139.60x = 17,030 × 12,139.60
4. Step 4: Simplify right side
   12,139.60x = 206,737,388
5. Step 5: Solve for x
   x = 206,737,388/12,139.60
6. Step 6: Final answer
   x = 17,030