Finding the Fourth Proportional to 13,962.72, 20,938.72 and 5,639.84

Step by Step Solution

1. Step 1: Write the proportion equation
   13,962.72 : 20,938.72 = 5,639.84 : x
2. Step 2: Convert to fraction form
   13,962.72/20,938.72 = 5,639.84/x
3. Step 3: Cross multiply
   13,962.72x = 20,938.72 × 5,639.84
4. Step 4: Simplify right side
   13,962.72x = 118,091,030.60
5. Step 5: Solve for x
   x = 118,091,030.60/13,962.72
6. Step 6: Final answer
   x = 8,457.59