Finding the Fourth Proportional to 105,621.92, 145,703.73 and 71,618.90

Step by Step Solution

1. Step 1: Write the proportion equation
   105,621.92 : 145,703.73 = 71,618.90 : x
2. Step 2: Convert to fraction form
   105,621.92/145,703.73 = 71,618.90/x
3. Step 3: Cross multiply
   105,621.92x = 145,703.73 × 71,618.90
4. Step 4: Simplify right side
   105,621.92x = 10,435,140,868.50
5. Step 5: Solve for x
   x = 10,435,140,868.50/105,621.92
6. Step 6: Final answer
   x = 98,797.11