Finding the Fourth Proportional to 10,978.62, 16,470.21 and 4,405.32

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.62 : 16,470.21 = 4,405.32 : x
2. Step 2: Convert to fraction form
   10,978.62/16,470.21 = 4,405.32/x
3. Step 3: Cross multiply
   10,978.62x = 16,470.21 × 4,405.32
4. Step 4: Simplify right side
   10,978.62x = 72,556,505.61
5. Step 5: Solve for x
   x = 72,556,505.61/10,978.62
6. Step 6: Final answer
   x = 6,608.89