Finding the Fourth Proportional to 13,139.24, 19,707 and 3,780.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139.24 : 19,707 = 3,780.05 : x
2. Step 2: Convert to fraction form
   13,139.24/19,707 = 3,780.05/x
3. Step 3: Cross multiply
   13,139.24x = 19,707 × 3,780.05
4. Step 4: Simplify right side
   13,139.24x = 74,493,445.35
5. Step 5: Solve for x
   x = 74,493,445.35/13,139.24
6. Step 6: Final answer
   x = 5,669.54