Finding the Fourth Proportional to 139,843.08, 209,947.56 and 83,020.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,843.08 : 209,947.56 = 83,020.72 : x
2. Step 2: Convert to fraction form
   139,843.08/209,947.56 = 83,020.72/x
3. Step 3: Cross multiply
   139,843.08x = 209,947.56 × 83,020.72
4. Step 4: Simplify right side
   139,843.08x = 17,429,997,858.12
5. Step 5: Solve for x
   x = 17,429,997,858.12/139,843.08
6. Step 6: Final answer
   x = 124,639.69