Finding the Fourth Proportional to 53,728.64, 74,141.18 and 31,069.10

Step by Step Solution

1. Step 1: Write the proportion equation
   53,728.64 : 74,141.18 = 31,069.10 : x
2. Step 2: Convert to fraction form
   53,728.64/74,141.18 = 31,069.10/x
3. Step 3: Cross multiply
   53,728.64x = 74,141.18 × 31,069.10
4. Step 4: Simplify right side
   53,728.64x = 2,303,499,735.54
5. Step 5: Solve for x
   x = 2,303,499,735.54/53,728.64
6. Step 6: Final answer
   x = 42,872.85