Finding the Fourth Proportional to 12,910.40, 19,316.72 and 7,648.23

Step by Step Solution

1. Step 1: Write the proportion equation
   12,910.40 : 19,316.72 = 7,648.23 : x
2. Step 2: Convert to fraction form
   12,910.40/19,316.72 = 7,648.23/x
3. Step 3: Cross multiply
   12,910.40x = 19,316.72 × 7,648.23
4. Step 4: Simplify right side
   12,910.40x = 147,738,736.53
5. Step 5: Solve for x
   x = 147,738,736.53/12,910.40
6. Step 6: Final answer
   x = 11,443.39