Finding the Fourth Proportional to 139,022.96, 208,502.24 and 82,878.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,022.96 : 208,502.24 = 82,878.80 : x
2. Step 2: Convert to fraction form
   139,022.96/208,502.24 = 82,878.80/x
3. Step 3: Cross multiply
   139,022.96x = 208,502.24 × 82,878.80
4. Step 4: Simplify right side
   139,022.96x = 17,280,415,448.51
5. Step 5: Solve for x
   x = 17,280,415,448.51/139,022.96
6. Step 6: Final answer
   x = 124,299.00