Finding the Fourth Proportional to 13,258.37, 19,878.78 and 5,247.83

Step by Step Solution

1. Step 1: Write the proportion equation
   13,258.37 : 19,878.78 = 5,247.83 : x
2. Step 2: Convert to fraction form
   13,258.37/19,878.78 = 5,247.83/x
3. Step 3: Cross multiply
   13,258.37x = 19,878.78 × 5,247.83
4. Step 4: Simplify right side
   13,258.37x = 104,320,507.74
5. Step 5: Solve for x
   x = 104,320,507.74/13,258.37
6. Step 6: Final answer
   x = 7,868.27