Finding the Fourth Proportional to 9,978.72, 13,771.32 and 5,999.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.72 : 13,771.32 = 5,999.76 : x
2. Step 2: Convert to fraction form
   9,978.72/13,771.32 = 5,999.76/x
3. Step 3: Cross multiply
   9,978.72x = 13,771.32 × 5,999.76
4. Step 4: Simplify right side
   9,978.72x = 82,624,614.88
5. Step 5: Solve for x
   x = 82,624,614.88/9,978.72
6. Step 6: Final answer
   x = 8,280.08