Finding the Fourth Proportional to 139,856.87, 209,693.38 and 67,790.70

Step by Step Solution

1. Step 1: Write the proportion equation
   139,856.87 : 209,693.38 = 67,790.70 : x
2. Step 2: Convert to fraction form
   139,856.87/209,693.38 = 67,790.70/x
3. Step 3: Cross multiply
   139,856.87x = 209,693.38 × 67,790.70
4. Step 4: Simplify right side
   139,856.87x = 14,215,261,015.57
5. Step 5: Solve for x
   x = 14,215,261,015.57/139,856.87
6. Step 6: Final answer
   x = 101,641.49