Finding the Fourth Proportional to 43,086.91, 64,632.43 and 13,505

Step by Step Solution

1. Step 1: Write the proportion equation
   43,086.91 : 64,632.43 = 13,505 : x
2. Step 2: Convert to fraction form
   43,086.91/64,632.43 = 13,505/x
3. Step 3: Cross multiply
   43,086.91x = 64,632.43 × 13,505
4. Step 4: Simplify right side
   43,086.91x = 872,860,967.15
5. Step 5: Solve for x
   x = 872,860,967.15/43,086.91
6. Step 6: Final answer
   x = 20,258.15