Finding the Fourth Proportional to 6,911.28, 10,368.72 and 1,981.29

Step by Step Solution

1. Step 1: Write the proportion equation
   6,911.28 : 10,368.72 = 1,981.29 : x
2. Step 2: Convert to fraction form
   6,911.28/10,368.72 = 1,981.29/x
3. Step 3: Cross multiply
   6,911.28x = 10,368.72 × 1,981.29
4. Step 4: Simplify right side
   6,911.28x = 20,543,441.25
5. Step 5: Solve for x
   x = 20,543,441.25/6,911.28
6. Step 6: Final answer
   x = 2,972.45