Finding the Fourth Proportional to 105,663.15, 145,871.28 and 71,852.13

Step by Step Solution

1. Step 1: Write the proportion equation
   105,663.15 : 145,871.28 = 71,852.13 : x
2. Step 2: Convert to fraction form
   105,663.15/145,871.28 = 71,852.13/x
3. Step 3: Cross multiply
   105,663.15x = 145,871.28 × 71,852.13
4. Step 4: Simplify right side
   105,663.15x = 10,481,162,173.83
5. Step 5: Solve for x
   x = 10,481,162,173.83/105,663.15
6. Step 6: Final answer
   x = 99,194.11