Finding the Fourth Proportional to 9,886.46, 13,642.97 and 5,409.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,886.46 : 13,642.97 = 5,409.99 : x
2. Step 2: Convert to fraction form
   9,886.46/13,642.97 = 5,409.99/x
3. Step 3: Cross multiply
   9,886.46x = 13,642.97 × 5,409.99
4. Step 4: Simplify right side
   9,886.46x = 73,808,304.22
5. Step 5: Solve for x
   x = 73,808,304.22/9,886.46
6. Step 6: Final answer
   x = 7,465.60