Finding the Fourth Proportional to 10,219.38, 15,320.71 and 5,290.44

Step by Step Solution

1. Step 1: Write the proportion equation
   10,219.38 : 15,320.71 = 5,290.44 : x
2. Step 2: Convert to fraction form
   10,219.38/15,320.71 = 5,290.44/x
3. Step 3: Cross multiply
   10,219.38x = 15,320.71 × 5,290.44
4. Step 4: Simplify right side
   10,219.38x = 81,053,297.01
5. Step 5: Solve for x
   x = 81,053,297.01/10,219.38
6. Step 6: Final answer
   x = 7,931.33