Finding the Fourth Proportional to 81,155.34, 111,860.55 and 54,288.18

Step by Step Solution

1. Step 1: Write the proportion equation
   81,155.34 : 111,860.55 = 54,288.18 : x
2. Step 2: Convert to fraction form
   81,155.34/111,860.55 = 54,288.18/x
3. Step 3: Cross multiply
   81,155.34x = 111,860.55 × 54,288.18
4. Step 4: Simplify right side
   81,155.34x = 6,072,705,673.30
5. Step 5: Solve for x
   x = 6,072,705,673.30/81,155.34
6. Step 6: Final answer
   x = 74,828.17