Finding the Fourth Proportional to 12,984.30, 19,498.05 and 7,145.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,984.30 : 19,498.05 = 7,145.10 : x
2. Step 2: Convert to fraction form
   12,984.30/19,498.05 = 7,145.10/x
3. Step 3: Cross multiply
   12,984.30x = 19,498.05 × 7,145.10
4. Step 4: Simplify right side
   12,984.30x = 139,315,517.06
5. Step 5: Solve for x
   x = 139,315,517.06/12,984.30
6. Step 6: Final answer
   x = 10,729.54