Finding the Fourth Proportional to 30,620.50, 42,259.53 and 19,442.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,620.50 : 42,259.53 = 19,442.50 : x
2. Step 2: Convert to fraction form
   30,620.50/42,259.53 = 19,442.50/x
3. Step 3: Cross multiply
   30,620.50x = 42,259.53 × 19,442.50
4. Step 4: Simplify right side
   30,620.50x = 821,630,912.03
5. Step 5: Solve for x
   x = 821,630,912.03/30,620.50
6. Step 6: Final answer
   x = 26,832.71