Finding the Fourth Proportional to 13,307.74, 19,961.59 and 5,414.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,307.74 : 19,961.59 = 5,414.55 : x
2. Step 2: Convert to fraction form
   13,307.74/19,961.59 = 5,414.55/x
3. Step 3: Cross multiply
   13,307.74x = 19,961.59 × 5,414.55
4. Step 4: Simplify right side
   13,307.74x = 108,082,948.89
5. Step 5: Solve for x
   x = 108,082,948.89/13,307.74
6. Step 6: Final answer
   x = 8,121.81