Finding the Fourth Proportional to 6,909.25, 10,363.61 and 1,978.69

Step by Step Solution

1. Step 1: Write the proportion equation
   6,909.25 : 10,363.61 = 1,978.69 : x
2. Step 2: Convert to fraction form
   6,909.25/10,363.61 = 1,978.69/x
3. Step 3: Cross multiply
   6,909.25x = 10,363.61 × 1,978.69
4. Step 4: Simplify right side
   6,909.25x = 20,506,361.58
5. Step 5: Solve for x
   x = 20,506,361.58/6,909.25
6. Step 6: Final answer
   x = 2,967.96