Finding the Fourth Proportional to 105,447.12, 145,462.53 and 71,443.97

Step by Step Solution

1. Step 1: Write the proportion equation
   105,447.12 : 145,462.53 = 71,443.97 : x
2. Step 2: Convert to fraction form
   105,447.12/145,462.53 = 71,443.97/x
3. Step 3: Cross multiply
   105,447.12x = 145,462.53 × 71,443.97
4. Step 4: Simplify right side
   105,447.12x = 10,392,421,533.76
5. Step 5: Solve for x
   x = 10,392,421,533.76/105,447.12
6. Step 6: Final answer
   x = 98,555.77