Finding the Fourth Proportional to 12,689.03, 17,510.72 and 7,023.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,689.03 : 17,510.72 = 7,023.78 : x
2. Step 2: Convert to fraction form
   12,689.03/17,510.72 = 7,023.78/x
3. Step 3: Cross multiply
   12,689.03x = 17,510.72 × 7,023.78
4. Step 4: Simplify right side
   12,689.03x = 122,991,409.80
5. Step 5: Solve for x
   x = 122,991,409.80/12,689.03
6. Step 6: Final answer
   x = 9,692.74