Finding the Fourth Proportional to 9,886.19, 13,642.81 and 5,409.86

Step by Step Solution

1. Step 1: Write the proportion equation
   9,886.19 : 13,642.81 = 5,409.86 : x
2. Step 2: Convert to fraction form
   9,886.19/13,642.81 = 5,409.86/x
3. Step 3: Cross multiply
   9,886.19x = 13,642.81 × 5,409.86
4. Step 4: Simplify right side
   9,886.19x = 73,805,610.37
5. Step 5: Solve for x
   x = 73,805,610.37/9,886.19
6. Step 6: Final answer
   x = 7,465.53