Finding the Fourth Proportional to 12,693.72, 17,518.20 and 7,028.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,693.72 : 17,518.20 = 7,028.70 : x
2. Step 2: Convert to fraction form
   12,693.72/17,518.20 = 7,028.70/x
3. Step 3: Cross multiply
   12,693.72x = 17,518.20 × 7,028.70
4. Step 4: Simplify right side
   12,693.72x = 123,130,172.34
5. Step 5: Solve for x
   x = 123,130,172.34/12,693.72
6. Step 6: Final answer
   x = 9,700.09