Finding the Fourth Proportional to 80,718.30, 111,405.18 and 50,515.86

Step by Step Solution

1. Step 1: Write the proportion equation
   80,718.30 : 111,405.18 = 50,515.86 : x
2. Step 2: Convert to fraction form
   80,718.30/111,405.18 = 50,515.86/x
3. Step 3: Cross multiply
   80,718.30x = 111,405.18 × 50,515.86
4. Step 4: Simplify right side
   80,718.30x = 5,627,728,476.15
5. Step 5: Solve for x
   x = 5,627,728,476.15/80,718.30
6. Step 6: Final answer
   x = 69,720.60