Finding the Fourth Proportional to 11,015.91, 16,520.35 and 3,618.64

Step by Step Solution

1. Step 1: Write the proportion equation
   11,015.91 : 16,520.35 = 3,618.64 : x
2. Step 2: Convert to fraction form
   11,015.91/16,520.35 = 3,618.64/x
3. Step 3: Cross multiply
   11,015.91x = 16,520.35 × 3,618.64
4. Step 4: Simplify right side
   11,015.91x = 59,781,199.32
5. Step 5: Solve for x
   x = 59,781,199.32/11,015.91
6. Step 6: Final answer
   x = 5,426.81