Finding the Fourth Proportional to 13,086.07, 18,063.48 and 7,780.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.07 : 18,063.48 = 7,780.88 : x
2. Step 2: Convert to fraction form
   13,086.07/18,063.48 = 7,780.88/x
3. Step 3: Cross multiply
   13,086.07x = 18,063.48 × 7,780.88
4. Step 4: Simplify right side
   13,086.07x = 140,549,650.77
5. Step 5: Solve for x
   x = 140,549,650.77/13,086.07
6. Step 6: Final answer
   x = 10,740.40