Finding the Fourth Proportional to 13,085.83, 18,063.08 and 7,780.62

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.83 : 18,063.08 = 7,780.62 : x
2. Step 2: Convert to fraction form
   13,085.83/18,063.08 = 7,780.62/x
3. Step 3: Cross multiply
   13,085.83x = 18,063.08 × 7,780.62
4. Step 4: Simplify right side
   13,085.83x = 140,541,961.51
5. Step 5: Solve for x
   x = 140,541,961.51/13,085.83
6. Step 6: Final answer
   x = 10,740.01