Finding the Fourth Proportional to 13,012.55, 19,529.89 and 5,120.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,012.55 : 19,529.89 = 5,120.59 : x
2. Step 2: Convert to fraction form
   13,012.55/19,529.89 = 5,120.59/x
3. Step 3: Cross multiply
   13,012.55x = 19,529.89 × 5,120.59
4. Step 4: Simplify right side
   13,012.55x = 100,004,559.44
5. Step 5: Solve for x
   x = 100,004,559.44/13,012.55
6. Step 6: Final answer
   x = 7,685.24