Finding the Fourth Proportional to 10,906.03, 16,363.90 and 3,978.91

Step by Step Solution

1. Step 1: Write the proportion equation
   10,906.03 : 16,363.90 = 3,978.91 : x
2. Step 2: Convert to fraction form
   10,906.03/16,363.90 = 3,978.91/x
3. Step 3: Cross multiply
   10,906.03x = 16,363.90 × 3,978.91
4. Step 4: Simplify right side
   10,906.03x = 65,110,485.35
5. Step 5: Solve for x
   x = 65,110,485.35/10,906.03
6. Step 6: Final answer
   x = 5,970.14