Finding the Fourth Proportional to 30,818.72, 42,530.64 and 18,253.28

Step by Step Solution

1. Step 1: Write the proportion equation
   30,818.72 : 42,530.64 = 18,253.28 : x
2. Step 2: Convert to fraction form
   30,818.72/42,530.64 = 18,253.28/x
3. Step 3: Cross multiply
   30,818.72x = 42,530.64 × 18,253.28
4. Step 4: Simplify right side
   30,818.72x = 776,323,680.50
5. Step 5: Solve for x
   x = 776,323,680.50/30,818.72
6. Step 6: Final answer
   x = 25,190.00