Finding the Fourth Proportional to 30,566.72, 42,189.57 and 18,636.63

Step by Step Solution

1. Step 1: Write the proportion equation
   30,566.72 : 42,189.57 = 18,636.63 : x
2. Step 2: Convert to fraction form
   30,566.72/42,189.57 = 18,636.63/x
3. Step 3: Cross multiply
   30,566.72x = 42,189.57 × 18,636.63
4. Step 4: Simplify right side
   30,566.72x = 786,271,405.95
5. Step 5: Solve for x
   x = 786,271,405.95/30,566.72
6. Step 6: Final answer
   x = 25,723.12