Finding the Fourth Proportional to 9,866.84, 13,615.72 and 5,390.53

Step by Step Solution

1. Step 1: Write the proportion equation
   9,866.84 : 13,615.72 = 5,390.53 : x
2. Step 2: Convert to fraction form
   9,866.84/13,615.72 = 5,390.53/x
3. Step 3: Cross multiply
   9,866.84x = 13,615.72 × 5,390.53
4. Step 4: Simplify right side
   9,866.84x = 73,395,899.62
5. Step 5: Solve for x
   x = 73,395,899.62/9,866.84
6. Step 6: Final answer
   x = 7,438.65