Finding the Fourth Proportional to 9,886.27, 13,642.72 and 5,409.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,886.27 : 13,642.72 = 5,409.72 : x
2. Step 2: Convert to fraction form
   9,886.27/13,642.72 = 5,409.72/x
3. Step 3: Cross multiply
   9,886.27x = 13,642.72 × 5,409.72
4. Step 4: Simplify right side
   9,886.27x = 73,803,337.72
5. Step 5: Solve for x
   x = 73,803,337.72/9,886.27
6. Step 6: Final answer
   x = 7,465.23