Finding the Fourth Proportional to 57,210.19, 78,954.72 and 31,724.54

Step by Step Solution

1. Step 1: Write the proportion equation
   57,210.19 : 78,954.72 = 31,724.54 : x
2. Step 2: Convert to fraction form
   57,210.19/78,954.72 = 31,724.54/x
3. Step 3: Cross multiply
   57,210.19x = 78,954.72 × 31,724.54
4. Step 4: Simplify right side
   57,210.19x = 2,504,802,172.83
5. Step 5: Solve for x
   x = 2,504,802,172.83/57,210.19
6. Step 6: Final answer
   x = 43,782.45