Finding the Fourth Proportional to 43,087.92, 64,632.69 and 13,505.10

Step by Step Solution

1. Step 1: Write the proportion equation
   43,087.92 : 64,632.69 = 13,505.10 : x
2. Step 2: Convert to fraction form
   43,087.92/64,632.69 = 13,505.10/x
3. Step 3: Cross multiply
   43,087.92x = 64,632.69 × 13,505.10
4. Step 4: Simplify right side
   43,087.92x = 872,870,941.72
5. Step 5: Solve for x
   x = 872,870,941.72/43,087.92
6. Step 6: Final answer
   x = 20,257.90