Finding the Fourth Proportional to 105,128.49, 157,653.99 and 82,683.06

Step by Step Solution

1. Step 1: Write the proportion equation
   105,128.49 : 157,653.99 = 82,683.06 : x
2. Step 2: Convert to fraction form
   105,128.49/157,653.99 = 82,683.06/x
3. Step 3: Cross multiply
   105,128.49x = 157,653.99 × 82,683.06
4. Step 4: Simplify right side
   105,128.49x = 13,035,314,314.41
5. Step 5: Solve for x
   x = 13,035,314,314.41/105,128.49
6. Step 6: Final answer
   x = 123,994.12