Finding the Fourth Proportional to 6,921.98, 10,384.69 and 1,991.95

Step by Step Solution

1. Step 1: Write the proportion equation
   6,921.98 : 10,384.69 = 1,991.95 : x
2. Step 2: Convert to fraction form
   6,921.98/10,384.69 = 1,991.95/x
3. Step 3: Cross multiply
   6,921.98x = 10,384.69 × 1,991.95
4. Step 4: Simplify right side
   6,921.98x = 20,685,783.25
5. Step 5: Solve for x
   x = 20,685,783.25/6,921.98
6. Step 6: Final answer
   x = 2,988.42