Finding the Fourth Proportional to 139,449.75, 192,947.31 and 121,581.96

Step by Step Solution

1. Step 1: Write the proportion equation
   139,449.75 : 192,947.31 = 121,581.96 : x
2. Step 2: Convert to fraction form
   139,449.75/192,947.31 = 121,581.96/x
3. Step 3: Cross multiply
   139,449.75x = 192,947.31 × 121,581.96
4. Step 4: Simplify right side
   139,449.75x = 23,458,912,126.53
5. Step 5: Solve for x
   x = 23,458,912,126.53/139,449.75
6. Step 6: Final answer
   x = 168,224.84