Finding the Fourth Proportional to 105,756.84, 145,969.83 and 71,821.89

Step by Step Solution

1. Step 1: Write the proportion equation
   105,756.84 : 145,969.83 = 71,821.89 : x
2. Step 2: Convert to fraction form
   105,756.84/145,969.83 = 71,821.89/x
3. Step 3: Cross multiply
   105,756.84x = 145,969.83 × 71,821.89
4. Step 4: Simplify right side
   105,756.84x = 10,483,829,073.58
5. Step 5: Solve for x
   x = 10,483,829,073.58/105,756.84
6. Step 6: Final answer
   x = 99,131.45