Finding the Fourth Proportional to 13,240.56, 19,860.72 and 3,379.70

Step by Step Solution

1. Step 1: Write the proportion equation
   13,240.56 : 19,860.72 = 3,379.70 : x
2. Step 2: Convert to fraction form
   13,240.56/19,860.72 = 3,379.70/x
3. Step 3: Cross multiply
   13,240.56x = 19,860.72 × 3,379.70
4. Step 4: Simplify right side
   13,240.56x = 67,123,275.38
5. Step 5: Solve for x
   x = 67,123,275.38/13,240.56
6. Step 6: Final answer
   x = 5,069.52