Finding the Fourth Proportional to 139,440.20, 209,162.73 and 56,334.20

Step by Step Solution

1. Step 1: Write the proportion equation
   139,440.20 : 209,162.73 = 56,334.20 : x
2. Step 2: Convert to fraction form
   139,440.20/209,162.73 = 56,334.20/x
3. Step 3: Cross multiply
   139,440.20x = 209,162.73 × 56,334.20
4. Step 4: Simplify right side
   139,440.20x = 11,783,014,018.55
5. Step 5: Solve for x
   x = 11,783,014,018.55/139,440.20
6. Step 6: Final answer
   x = 84,502.28