Finding the Fourth Proportional to 13,258.40, 19,887.15 and 3,397.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,258.40 : 19,887.15 = 3,397.78 : x
2. Step 2: Convert to fraction form
   13,258.40/19,887.15 = 3,397.78/x
3. Step 3: Cross multiply
   13,258.40x = 19,887.15 × 3,397.78
4. Step 4: Simplify right side
   13,258.40x = 67,572,061.09
5. Step 5: Solve for x
   x = 67,572,061.09/13,258.40
6. Step 6: Final answer
   x = 5,096.55