Finding the Fourth Proportional to 30,485.61, 42,076.71 and 18,552.80

Step by Step Solution

1. Step 1: Write the proportion equation
   30,485.61 : 42,076.71 = 18,552.80 : x
2. Step 2: Convert to fraction form
   30,485.61/42,076.71 = 18,552.80/x
3. Step 3: Cross multiply
   30,485.61x = 42,076.71 × 18,552.80
4. Step 4: Simplify right side
   30,485.61x = 780,640,574.90
5. Step 5: Solve for x
   x = 780,640,574.90/30,485.61
6. Step 6: Final answer
   x = 25,606.85