Finding the Fourth Proportional to 139,354, 209,065.72 and 40,858

Step by Step Solution

1. Step 1: Write the proportion equation
   139,354 : 209,065.72 = 40,858 : x
2. Step 2: Convert to fraction form
   139,354/209,065.72 = 40,858/x
3. Step 3: Cross multiply
   139,354x = 209,065.72 × 40,858
4. Step 4: Simplify right side
   139,354x = 8,542,007,187.76
5. Step 5: Solve for x
   x = 8,542,007,187.76/139,354
6. Step 6: Final answer
   x = 61,297.18