Finding the Fourth Proportional to 13,139.56, 19,706.46 and 3,907.24

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139.56 : 19,706.46 = 3,907.24 : x
2. Step 2: Convert to fraction form
   13,139.56/19,706.46 = 3,907.24/x
3. Step 3: Cross multiply
   13,139.56x = 19,706.46 × 3,907.24
4. Step 4: Simplify right side
   13,139.56x = 76,997,868.77
5. Step 5: Solve for x
   x = 76,997,868.77/13,139.56
6. Step 6: Final answer
   x = 5,860.00