Finding the Fourth Proportional to 9,726.84, 13,424.31 and 5,478.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,726.84 : 13,424.31 = 5,478.72 : x
2. Step 2: Convert to fraction form
   9,726.84/13,424.31 = 5,478.72/x
3. Step 3: Cross multiply
   9,726.84x = 13,424.31 × 5,478.72
4. Step 4: Simplify right side
   9,726.84x = 73,548,035.68
5. Step 5: Solve for x
   x = 73,548,035.68/9,726.84
6. Step 6: Final answer
   x = 7,561.35