Finding the Fourth Proportional to 10,917.45, 16,379.64 and 3,897.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,917.45 : 16,379.64 = 3,897.31 : x
2. Step 2: Convert to fraction form
   10,917.45/16,379.64 = 3,897.31/x
3. Step 3: Cross multiply
   10,917.45x = 16,379.64 × 3,897.31
4. Step 4: Simplify right side
   10,917.45x = 63,836,540.63
5. Step 5: Solve for x
   x = 63,836,540.63/10,917.45
6. Step 6: Final answer
   x = 5,847.20