Finding the Fourth Proportional to 6,980.78, 9,633.94 and 3,997.02

Step by Step Solution

1. Step 1: Write the proportion equation
   6,980.78 : 9,633.94 = 3,997.02 : x
2. Step 2: Convert to fraction form
   6,980.78/9,633.94 = 3,997.02/x
3. Step 3: Cross multiply
   6,980.78x = 9,633.94 × 3,997.02
4. Step 4: Simplify right side
   6,980.78x = 38,507,050.86
5. Step 5: Solve for x
   x = 38,507,050.86/6,980.78
6. Step 6: Final answer
   x = 5,516.15