Finding the Fourth Proportional to 13,120.77, 18,106.57 and 7,152.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,120.77 : 18,106.57 = 7,152.69 : x
2. Step 2: Convert to fraction form
   13,120.77/18,106.57 = 7,152.69/x
3. Step 3: Cross multiply
   13,120.77x = 18,106.57 × 7,152.69
4. Step 4: Simplify right side
   13,120.77x = 129,510,682.17
5. Step 5: Solve for x
   x = 129,510,682.17/13,120.77
6. Step 6: Final answer
   x = 9,870.66