Finding the Fourth Proportional to 6,613.76, 9,921.12 and 1,997.12

Step by Step Solution

1. Step 1: Write the proportion equation
   6,613.76 : 9,921.12 = 1,997.12 : x
2. Step 2: Convert to fraction form
   6,613.76/9,921.12 = 1,997.12/x
3. Step 3: Cross multiply
   6,613.76x = 9,921.12 × 1,997.12
4. Step 4: Simplify right side
   6,613.76x = 19,813,667.17
5. Step 5: Solve for x
   x = 19,813,667.17/6,613.76
6. Step 6: Final answer
   x = 2,995.82