Finding the Fourth Proportional to 10,997.57, 16,497.98 and 3,978.11

Step by Step Solution

1. Step 1: Write the proportion equation
   10,997.57 : 16,497.98 = 3,978.11 : x
2. Step 2: Convert to fraction form
   10,997.57/16,497.98 = 3,978.11/x
3. Step 3: Cross multiply
   10,997.57x = 16,497.98 × 3,978.11
4. Step 4: Simplify right side
   10,997.57x = 65,630,779.22
5. Step 5: Solve for x
   x = 65,630,779.22/10,997.57
6. Step 6: Final answer
   x = 5,967.75