Finding the Fourth Proportional to 13,086.64, 18,058.71 and 7,781.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.64 : 18,058.71 = 7,781.86 : x
2. Step 2: Convert to fraction form
   13,086.64/18,058.71 = 7,781.86/x
3. Step 3: Cross multiply
   13,086.64x = 18,058.71 × 7,781.86
4. Step 4: Simplify right side
   13,086.64x = 140,530,353.00
5. Step 5: Solve for x
   x = 140,530,353.00/13,086.64
6. Step 6: Final answer
   x = 10,738.46