Finding the Fourth Proportional to 105,624.42, 145,707.18 and 71,621.40

Step by Step Solution

1. Step 1: Write the proportion equation
   105,624.42 : 145,707.18 = 71,621.40 : x
2. Step 2: Convert to fraction form
   105,624.42/145,707.18 = 71,621.40/x
3. Step 3: Cross multiply
   105,624.42x = 145,707.18 × 71,621.40
4. Step 4: Simplify right side
   105,624.42x = 10,435,752,221.65
5. Step 5: Solve for x
   x = 10,435,752,221.65/105,624.42
6. Step 6: Final answer
   x = 98,800.56