Finding the Fourth Proportional to 13,731.34, 20,603.91 and 5,417.32

Step by Step Solution

1. Step 1: Write the proportion equation
   13,731.34 : 20,603.91 = 5,417.32 : x
2. Step 2: Convert to fraction form
   13,731.34/20,603.91 = 5,417.32/x
3. Step 3: Cross multiply
   13,731.34x = 20,603.91 × 5,417.32
4. Step 4: Simplify right side
   13,731.34x = 111,617,973.72
5. Step 5: Solve for x
   x = 111,617,973.72/13,731.34
6. Step 6: Final answer
   x = 8,128.70