Finding the Fourth Proportional to 10,521.83, 15,767.71 and 7,726.57

Step by Step Solution

1. Step 1: Write the proportion equation
   10,521.83 : 15,767.71 = 7,726.57 : x
2. Step 2: Convert to fraction form
   10,521.83/15,767.71 = 7,726.57/x
3. Step 3: Cross multiply
   10,521.83x = 15,767.71 × 7,726.57
4. Step 4: Simplify right side
   10,521.83x = 121,830,315.05
5. Step 5: Solve for x
   x = 121,830,315.05/10,521.83
6. Step 6: Final answer
   x = 11,578.81