Finding the Fourth Proportional to 13,120.29, 18,106.52 and 7,152.03

Step by Step Solution

1. Step 1: Write the proportion equation
   13,120.29 : 18,106.52 = 7,152.03 : x
2. Step 2: Convert to fraction form
   13,120.29/18,106.52 = 7,152.03/x
3. Step 3: Cross multiply
   13,120.29x = 18,106.52 × 7,152.03
4. Step 4: Simplify right side
   13,120.29x = 129,498,338.48
5. Step 5: Solve for x
   x = 129,498,338.48/13,120.29
6. Step 6: Final answer
   x = 9,870.08