Finding the Fourth Proportional to 139,782.82, 209,673.24 and 83,638.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,782.82 : 209,673.24 = 83,638.57 : x
2. Step 2: Convert to fraction form
   139,782.82/209,673.24 = 83,638.57/x
3. Step 3: Cross multiply
   139,782.82x = 209,673.24 × 83,638.57
4. Step 4: Simplify right side
   139,782.82x = 17,536,769,960.87
5. Step 5: Solve for x
   x = 17,536,769,960.87/139,782.82
6. Step 6: Final answer
   x = 125,457.26