Finding the Fourth Proportional to 139,918.56, 209,876.16 and 83,774.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,918.56 : 209,876.16 = 83,774.28 : x
2. Step 2: Convert to fraction form
   139,918.56/209,876.16 = 83,774.28/x
3. Step 3: Cross multiply
   139,918.56x = 209,876.16 × 83,774.28
4. Step 4: Simplify right side
   139,918.56x = 17,582,224,193.16
5. Step 5: Solve for x
   x = 17,582,224,193.16/139,918.56
6. Step 6: Final answer
   x = 125,660.41