Finding the Fourth Proportional to 30,990.08, 42,760.72 and 18,242.24

Step by Step Solution

1. Step 1: Write the proportion equation
   30,990.08 : 42,760.72 = 18,242.24 : x
2. Step 2: Convert to fraction form
   30,990.08/42,760.72 = 18,242.24/x
3. Step 3: Cross multiply
   30,990.08x = 42,760.72 × 18,242.24
4. Step 4: Simplify right side
   30,990.08x = 780,051,316.81
5. Step 5: Solve for x
   x = 780,051,316.81/30,990.08
6. Step 6: Final answer
   x = 25,171.00