Finding the Fourth Proportional to 9,726.78, 13,421.48 and 5,477.62

Step by Step Solution

1. Step 1: Write the proportion equation
   9,726.78 : 13,421.48 = 5,477.62 : x
2. Step 2: Convert to fraction form
   9,726.78/13,421.48 = 5,477.62/x
3. Step 3: Cross multiply
   9,726.78x = 13,421.48 × 5,477.62
4. Step 4: Simplify right side
   9,726.78x = 73,517,706.34
5. Step 5: Solve for x
   x = 73,517,706.34/9,726.78
6. Step 6: Final answer
   x = 7,558.28