Finding the Fourth Proportional to 105,618.42, 145,698.90 and 71,615.40

Step by Step Solution

1. Step 1: Write the proportion equation
   105,618.42 : 145,698.90 = 71,615.40 : x
2. Step 2: Convert to fraction form
   105,618.42/145,698.90 = 71,615.40/x
3. Step 3: Cross multiply
   105,618.42x = 145,698.90 × 71,615.40
4. Step 4: Simplify right side
   105,618.42x = 10,434,285,003.06
5. Step 5: Solve for x
   x = 10,434,285,003.06/105,618.42
6. Step 6: Final answer
   x = 98,792.28