Finding the Fourth Proportional to 13,261.79, 19,891.18 and 3,401.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,261.79 : 19,891.18 = 3,401.30 : x
2. Step 2: Convert to fraction form
   13,261.79/19,891.18 = 3,401.30/x
3. Step 3: Cross multiply
   13,261.79x = 19,891.18 × 3,401.30
4. Step 4: Simplify right side
   13,261.79x = 67,655,870.53
5. Step 5: Solve for x
   x = 67,655,870.53/13,261.79
6. Step 6: Final answer
   x = 5,101.56