Finding the Fourth Proportional to 13,120.53, 18,106.28 and 7,152.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,120.53 : 18,106.28 = 7,152.18 : x
2. Step 2: Convert to fraction form
   13,120.53/18,106.28 = 7,152.18/x
3. Step 3: Cross multiply
   13,120.53x = 18,106.28 × 7,152.18
4. Step 4: Simplify right side
   13,120.53x = 129,499,373.69
5. Step 5: Solve for x
   x = 129,499,373.69/13,120.53
6. Step 6: Final answer
   x = 9,869.98