Finding the Fourth Proportional to 105,683.99, 145,678.23 and 80,087.88

Step by Step Solution

1. Step 1: Write the proportion equation
   105,683.99 : 145,678.23 = 80,087.88 : x
2. Step 2: Convert to fraction form
   105,683.99/145,678.23 = 80,087.88/x
3. Step 3: Cross multiply
   105,683.99x = 145,678.23 × 80,087.88
4. Step 4: Simplify right side
   105,683.99x = 11,667,061,149.15
5. Step 5: Solve for x
   x = 11,667,061,149.15/105,683.99
6. Step 6: Final answer
   x = 110,395.73