Finding the Fourth Proportional to 13,120.69, 18,106.45 and 7,152.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,120.69 : 18,106.45 = 7,152.34 : x
2. Step 2: Convert to fraction form
   13,120.69/18,106.45 = 7,152.34/x
3. Step 3: Cross multiply
   13,120.69x = 18,106.45 × 7,152.34
4. Step 4: Simplify right side
   13,120.69x = 129,503,486.59
5. Step 5: Solve for x
   x = 129,503,486.59/13,120.69
6. Step 6: Final answer
   x = 9,870.17