Finding the Fourth Proportional to 30,456.80, 45,679.61 and 13,812.83

Step by Step Solution

1. Step 1: Write the proportion equation
   30,456.80 : 45,679.61 = 13,812.83 : x
2. Step 2: Convert to fraction form
   30,456.80/45,679.61 = 13,812.83/x
3. Step 3: Cross multiply
   30,456.80x = 45,679.61 × 13,812.83
4. Step 4: Simplify right side
   30,456.80x = 630,964,389.93
5. Step 5: Solve for x
   x = 630,964,389.93/30,456.80
6. Step 6: Final answer
   x = 20,716.70