Finding the Fourth Proportional to 53,490.20, 80,191.55 and 20,191.30

Step by Step Solution

1. Step 1: Write the proportion equation
   53,490.20 : 80,191.55 = 20,191.30 : x
2. Step 2: Convert to fraction form
   53,490.20/80,191.55 = 20,191.30/x
3. Step 3: Cross multiply
   53,490.20x = 80,191.55 × 20,191.30
4. Step 4: Simplify right side
   53,490.20x = 1,619,171,493.51
5. Step 5: Solve for x
   x = 1,619,171,493.51/53,490.20
6. Step 6: Final answer
   x = 30,270.44