Finding the Fourth Proportional to 13,089.85, 18,061.54 and 7,785.97

Step by Step Solution

1. Step 1: Write the proportion equation
   13,089.85 : 18,061.54 = 7,785.97 : x
2. Step 2: Convert to fraction form
   13,089.85/18,061.54 = 7,785.97/x
3. Step 3: Cross multiply
   13,089.85x = 18,061.54 × 7,785.97
4. Step 4: Simplify right side
   13,089.85x = 140,626,608.59
5. Step 5: Solve for x
   x = 140,626,608.59/13,089.85
6. Step 6: Final answer
   x = 10,743.18