Finding the Fourth Proportional to 9,726.88, 13,422.86 and 5,419.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,726.88 : 13,422.86 = 5,419.94 : x
2. Step 2: Convert to fraction form
   9,726.88/13,422.86 = 5,419.94/x
3. Step 3: Cross multiply
   9,726.88x = 13,422.86 × 5,419.94
4. Step 4: Simplify right side
   9,726.88x = 72,751,095.83
5. Step 5: Solve for x
   x = 72,751,095.83/9,726.88
6. Step 6: Final answer
   x = 7,479.39