Finding the Fourth Proportional to 12,890, 17,788.20 and 7,002

Step by Step Solution

1. Step 1: Write the proportion equation
   12,890 : 17,788.20 = 7,002 : x
2. Step 2: Convert to fraction form
   12,890/17,788.20 = 7,002/x
3. Step 3: Cross multiply
   12,890x = 17,788.20 × 7,002
4. Step 4: Simplify right side
   12,890x = 124,552,976.40
5. Step 5: Solve for x
   x = 124,552,976.40/12,890
6. Step 6: Final answer
   x = 9,662.76