Finding the Fourth Proportional to 30,724.72, 42,405.72 and 17,977.16

Step by Step Solution

1. Step 1: Write the proportion equation
   30,724.72 : 42,405.72 = 17,977.16 : x
2. Step 2: Convert to fraction form
   30,724.72/42,405.72 = 17,977.16/x
3. Step 3: Cross multiply
   30,724.72x = 42,405.72 × 17,977.16
4. Step 4: Simplify right side
   30,724.72x = 762,334,451.96
5. Step 5: Solve for x
   x = 762,334,451.96/30,724.72
6. Step 6: Final answer
   x = 24,811.76