Finding the Fourth Proportional to 139,784.82, 209,676.24 and 83,640.58

Step by Step Solution

1. Step 1: Write the proportion equation
   139,784.82 : 209,676.24 = 83,640.58 : x
2. Step 2: Convert to fraction form
   139,784.82/209,676.24 = 83,640.58/x
3. Step 3: Cross multiply
   139,784.82x = 209,676.24 × 83,640.58
4. Step 4: Simplify right side
   139,784.82x = 17,537,442,325.82
5. Step 5: Solve for x
   x = 17,537,442,325.82/139,784.82
6. Step 6: Final answer
   x = 125,460.28