Finding the Fourth Proportional to 13,086.76, 18,059.58 and 7,781.46

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.76 : 18,059.58 = 7,781.46 : x
2. Step 2: Convert to fraction form
   13,086.76/18,059.58 = 7,781.46/x
3. Step 3: Cross multiply
   13,086.76x = 18,059.58 × 7,781.46
4. Step 4: Simplify right side
   13,086.76x = 140,529,899.39
5. Step 5: Solve for x
   x = 140,529,899.39/13,086.76
6. Step 6: Final answer
   x = 10,738.33