Finding the Fourth Proportional to 13,736.64, 20,603.52 and 5,414.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,736.64 : 20,603.52 = 5,414.88 : x
2. Step 2: Convert to fraction form
   13,736.64/20,603.52 = 5,414.88/x
3. Step 3: Cross multiply
   13,736.64x = 20,603.52 × 5,414.88
4. Step 4: Simplify right side
   13,736.64x = 111,565,588.38
5. Step 5: Solve for x
   x = 111,565,588.38/13,736.64
6. Step 6: Final answer
   x = 8,121.75