Finding the Fourth Proportional to 10,961.30, 16,431.15 and 5,410.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,961.30 : 16,431.15 = 5,410.10 : x
2. Step 2: Convert to fraction form
   10,961.30/16,431.15 = 5,410.10/x
3. Step 3: Cross multiply
   10,961.30x = 16,431.15 × 5,410.10
4. Step 4: Simplify right side
   10,961.30x = 88,894,164.62
5. Step 5: Solve for x
   x = 88,894,164.62/10,961.30
6. Step 6: Final answer
   x = 8,109.82