Finding the Fourth Proportional to 12,915.58, 19,371.29 and 3,679.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,915.58 : 19,371.29 = 3,679.42 : x
2. Step 2: Convert to fraction form
   12,915.58/19,371.29 = 3,679.42/x
3. Step 3: Cross multiply
   12,915.58x = 19,371.29 × 3,679.42
4. Step 4: Simplify right side
   12,915.58x = 71,275,111.85
5. Step 5: Solve for x
   x = 71,275,111.85/12,915.58
6. Step 6: Final answer
   x = 5,518.54