Finding the Fourth Proportional to 139,891.72, 209,839.04 and 111,989.16

Step by Step Solution

1. Step 1: Write the proportion equation
   139,891.72 : 209,839.04 = 111,989.16 : x
2. Step 2: Convert to fraction form
   139,891.72/209,839.04 = 111,989.16/x
3. Step 3: Cross multiply
   139,891.72x = 209,839.04 × 111,989.16
4. Step 4: Simplify right side
   139,891.72x = 23,499,697,824.81
5. Step 5: Solve for x
   x = 23,499,697,824.81/139,891.72
6. Step 6: Final answer
   x = 167,984.91