Finding the Fourth Proportional to 105,757.84, 145,971.21 and 71,822.89

Step by Step Solution

1. Step 1: Write the proportion equation
   105,757.84 : 145,971.21 = 71,822.89 : x
2. Step 2: Convert to fraction form
   105,757.84/145,971.21 = 71,822.89/x
3. Step 3: Cross multiply
   105,757.84x = 145,971.21 × 71,822.89
4. Step 4: Simplify right side
   105,757.84x = 10,484,074,159.00
5. Step 5: Solve for x
   x = 10,484,074,159.00/105,757.84
6. Step 6: Final answer
   x = 99,132.83