Finding the Fourth Proportional to 10,978.75, 16,470.21 and 4,405.45

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.75 : 16,470.21 = 4,405.45 : x
2. Step 2: Convert to fraction form
   10,978.75/16,470.21 = 4,405.45/x
3. Step 3: Cross multiply
   10,978.75x = 16,470.21 × 4,405.45
4. Step 4: Simplify right side
   10,978.75x = 72,558,664.62
5. Step 5: Solve for x
   x = 72,558,664.62/10,978.75
6. Step 6: Final answer
   x = 6,609.01