Finding the Fourth Proportional to 9,919.18, 13,696.23 and 7,429.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,919.18 : 13,696.23 = 7,429.78 : x
2. Step 2: Convert to fraction form
   9,919.18/13,696.23 = 7,429.78/x
3. Step 3: Cross multiply
   9,919.18x = 13,696.23 × 7,429.78
4. Step 4: Simplify right side
   9,919.18x = 101,759,975.73
5. Step 5: Solve for x
   x = 101,759,975.73/9,919.18
6. Step 6: Final answer
   x = 10,258.91