Finding the Fourth Proportional to 30,579.21, 42,199.71 and 18,478.01

Step by Step Solution

1. Step 1: Write the proportion equation
   30,579.21 : 42,199.71 = 18,478.01 : x
2. Step 2: Convert to fraction form
   30,579.21/42,199.71 = 18,478.01/x
3. Step 3: Cross multiply
   30,579.21x = 42,199.71 × 18,478.01
4. Step 4: Simplify right side
   30,579.21x = 779,766,663.38
5. Step 5: Solve for x
   x = 779,766,663.38/30,579.21
6. Step 6: Final answer
   x = 25,499.90