Finding the Fourth Proportional to 10,996.90, 16,464.15 and 8,536.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,996.90 : 16,464.15 = 8,536.10 : x
2. Step 2: Convert to fraction form
   10,996.90/16,464.15 = 8,536.10/x
3. Step 3: Cross multiply
   10,996.90x = 16,464.15 × 8,536.10
4. Step 4: Simplify right side
   10,996.90x = 140,539,630.82
5. Step 5: Solve for x
   x = 140,539,630.82/10,996.90
6. Step 6: Final answer
   x = 12,779.93