Finding the Fourth Proportional to 111,150.09, 153,287.78 and 81,005.67

Step by Step Solution

1. Step 1: Write the proportion equation
   111,150.09 : 153,287.78 = 81,005.67 : x
2. Step 2: Convert to fraction form
   111,150.09/153,287.78 = 81,005.67/x
3. Step 3: Cross multiply
   111,150.09x = 153,287.78 × 81,005.67
4. Step 4: Simplify right side
   111,150.09x = 12,417,178,916.68
5. Step 5: Solve for x
   x = 12,417,178,916.68/111,150.09
6. Step 6: Final answer
   x = 111,715.42