Finding the Fourth Proportional to 113,405.80, 170,111.50 and 54,247.72

Step by Step Solution

1. Step 1: Write the proportion equation
   113,405.80 : 170,111.50 = 54,247.72 : x
2. Step 2: Convert to fraction form
   113,405.80/170,111.50 = 54,247.72/x
3. Step 3: Cross multiply
   113,405.80x = 170,111.50 × 54,247.72
4. Step 4: Simplify right side
   113,405.80x = 9,228,161,020.78
5. Step 5: Solve for x
   x = 9,228,161,020.78/113,405.80
6. Step 6: Final answer
   x = 81,372.92