Finding the Fourth Proportional to 105,447.87, 145,463.57 and 71,444.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,447.87 : 145,463.57 = 71,444.72 : x
2. Step 2: Convert to fraction form
   105,447.87/145,463.57 = 71,444.72/x
3. Step 3: Cross multiply
   105,447.87x = 145,463.57 × 71,444.72
4. Step 4: Simplify right side
   105,447.87x = 10,392,604,035.29
5. Step 5: Solve for x
   x = 10,392,604,035.29/105,447.87
6. Step 6: Final answer
   x = 98,556.79