Finding the Fourth Proportional to 13,256.78, 19,884.71 and 3,396.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,256.78 : 19,884.71 = 3,396.15 : x
2. Step 2: Convert to fraction form
   13,256.78/19,884.71 = 3,396.15/x
3. Step 3: Cross multiply
   13,256.78x = 19,884.71 × 3,396.15
4. Step 4: Simplify right side
   13,256.78x = 67,531,440.89
5. Step 5: Solve for x
   x = 67,531,440.89/13,256.78
6. Step 6: Final answer
   x = 5,094.11