Finding the Fourth Proportional to 10,422.78, 15,620.61 and 7,948.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,422.78 : 15,620.61 = 7,948.50 : x
2. Step 2: Convert to fraction form
   10,422.78/15,620.61 = 7,948.50/x
3. Step 3: Cross multiply
   10,422.78x = 15,620.61 × 7,948.50
4. Step 4: Simplify right side
   10,422.78x = 124,160,418.59
5. Step 5: Solve for x
   x = 124,160,418.59/10,422.78
6. Step 6: Final answer
   x = 11,912.41