Finding the Fourth Proportional to 10,345.28, 15,490.38 and 7,064.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,345.28 : 15,490.38 = 7,064.78 : x
2. Step 2: Convert to fraction form
   10,345.28/15,490.38 = 7,064.78/x
3. Step 3: Cross multiply
   10,345.28x = 15,490.38 × 7,064.78
4. Step 4: Simplify right side
   10,345.28x = 109,436,126.82
5. Step 5: Solve for x
   x = 109,436,126.82/10,345.28
6. Step 6: Final answer
   x = 10,578.36