Finding the Fourth Proportional to 11,338.80, 15,618.18 and 7,929.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,338.80 : 15,618.18 = 7,929.78 : x
2. Step 2: Convert to fraction form
   11,338.80/15,618.18 = 7,929.78/x
3. Step 3: Cross multiply
   11,338.80x = 15,618.18 × 7,929.78
4. Step 4: Simplify right side
   11,338.80x = 123,848,731.40
5. Step 5: Solve for x
   x = 123,848,731.40/11,338.80
6. Step 6: Final answer
   x = 10,922.56