Finding the Fourth Proportional to 12,786.60, 19,178.34 and 3,427.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,786.60 : 19,178.34 = 3,427.32 : x
2. Step 2: Convert to fraction form
   12,786.60/19,178.34 = 3,427.32/x
3. Step 3: Cross multiply
   12,786.60x = 19,178.34 × 3,427.32
4. Step 4: Simplify right side
   12,786.60x = 65,730,308.25
5. Step 5: Solve for x
   x = 65,730,308.25/12,786.60
6. Step 6: Final answer
   x = 5,140.56