Finding the Fourth Proportional to 30,748.59, 42,455.79 and 18,828.18

Step by Step Solution

1. Step 1: Write the proportion equation
   30,748.59 : 42,455.79 = 18,828.18 : x
2. Step 2: Convert to fraction form
   30,748.59/42,455.79 = 18,828.18/x
3. Step 3: Cross multiply
   30,748.59x = 42,455.79 × 18,828.18
4. Step 4: Simplify right side
   30,748.59x = 799,365,256.16
5. Step 5: Solve for x
   x = 799,365,256.16/30,748.59
6. Step 6: Final answer
   x = 25,996.81