Finding the Fourth Proportional to 30,986.79, 42,748.02 and 18,404.25

Step by Step Solution

1. Step 1: Write the proportion equation
   30,986.79 : 42,748.02 = 18,404.25 : x
2. Step 2: Convert to fraction form
   30,986.79/42,748.02 = 18,404.25/x
3. Step 3: Cross multiply
   30,986.79x = 42,748.02 × 18,404.25
4. Step 4: Simplify right side
   30,986.79x = 786,745,247.09
5. Step 5: Solve for x
   x = 786,745,247.09/30,986.79
6. Step 6: Final answer
   x = 25,389.70