Finding the Fourth Proportional to 13,088.86, 18,062.58 and 7,120.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,088.86 : 18,062.58 = 7,120.42 : x
2. Step 2: Convert to fraction form
   13,088.86/18,062.58 = 7,120.42/x
3. Step 3: Cross multiply
   13,088.86x = 18,062.58 × 7,120.42
4. Step 4: Simplify right side
   13,088.86x = 128,613,155.88
5. Step 5: Solve for x
   x = 128,613,155.88/13,088.86
6. Step 6: Final answer
   x = 9,826.15