Finding the Fourth Proportional to 6,642.84, 9,961.89 and 2,199.69

Step by Step Solution

1. Step 1: Write the proportion equation
   6,642.84 : 9,961.89 = 2,199.69 : x
2. Step 2: Convert to fraction form
   6,642.84/9,961.89 = 2,199.69/x
3. Step 3: Cross multiply
   6,642.84x = 9,961.89 × 2,199.69
4. Step 4: Simplify right side
   6,642.84x = 21,913,061.57
5. Step 5: Solve for x
   x = 21,913,061.57/6,642.84
6. Step 6: Final answer
   x = 3,298.75