Finding the Fourth Proportional to 53,421.69, 80,151.12 and 20,151.30

Step by Step Solution

1. Step 1: Write the proportion equation
   53,421.69 : 80,151.12 = 20,151.30 : x
2. Step 2: Convert to fraction form
   53,421.69/80,151.12 = 20,151.30/x
3. Step 3: Cross multiply
   53,421.69x = 80,151.12 × 20,151.30
4. Step 4: Simplify right side
   53,421.69x = 1,615,149,264.46
5. Step 5: Solve for x
   x = 1,615,149,264.46/53,421.69
6. Step 6: Final answer
   x = 30,233.96