Finding the Fourth Proportional to 30,217.98, 45,314.49 and 13,121.98

Step by Step Solution

1. Step 1: Write the proportion equation
   30,217.98 : 45,314.49 = 13,121.98 : x
2. Step 2: Convert to fraction form
   30,217.98/45,314.49 = 13,121.98/x
3. Step 3: Cross multiply
   30,217.98x = 45,314.49 × 13,121.98
4. Step 4: Simplify right side
   30,217.98x = 594,615,730.51
5. Step 5: Solve for x
   x = 594,615,730.51/30,217.98
6. Step 6: Final answer
   x = 19,677.55