Finding the Fourth Proportional to 139,835.59, 209,936.32 and 83,013.23

Step by Step Solution

1. Step 1: Write the proportion equation
   139,835.59 : 209,936.32 = 83,013.23 : x
2. Step 2: Convert to fraction form
   139,835.59/209,936.32 = 83,013.23/x
3. Step 3: Cross multiply
   139,835.59x = 209,936.32 × 83,013.23
4. Step 4: Simplify right side
   139,835.59x = 17,427,492,017.51
5. Step 5: Solve for x
   x = 17,427,492,017.51/139,835.59
6. Step 6: Final answer
   x = 124,628.44