Finding the Fourth Proportional to 12,948.82, 19,431.63 and 7,109.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,948.82 : 19,431.63 = 7,109.50 : x
2. Step 2: Convert to fraction form
   12,948.82/19,431.63 = 7,109.50/x
3. Step 3: Cross multiply
   12,948.82x = 19,431.63 × 7,109.50
4. Step 4: Simplify right side
   12,948.82x = 138,149,173.49
5. Step 5: Solve for x
   x = 138,149,173.49/12,948.82
6. Step 6: Final answer
   x = 10,668.86