Finding the Fourth Proportional to 139,022.87, 208,502.31 and 82,878.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,022.87 : 208,502.31 = 82,878.80 : x
2. Step 2: Convert to fraction form
   139,022.87/208,502.31 = 82,878.80/x
3. Step 3: Cross multiply
   139,022.87x = 208,502.31 × 82,878.80
4. Step 4: Simplify right side
   139,022.87x = 17,280,421,250.03
5. Step 5: Solve for x
   x = 17,280,421,250.03/139,022.87
6. Step 6: Final answer
   x = 124,299.13