Finding the Fourth Proportional to 13,257.78, 19,886.20 and 3,397.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,257.78 : 19,886.20 = 3,397.15 : x
2. Step 2: Convert to fraction form
   13,257.78/19,886.20 = 3,397.15/x
3. Step 3: Cross multiply
   13,257.78x = 19,886.20 × 3,397.15
4. Step 4: Simplify right side
   13,257.78x = 67,556,404.33
5. Step 5: Solve for x
   x = 67,556,404.33/13,257.78
6. Step 6: Final answer
   x = 5,095.60