Finding the Fourth Proportional to 30,648.32, 45,945.12 and 13,109.12

Step by Step Solution

1. Step 1: Write the proportion equation
   30,648.32 : 45,945.12 = 13,109.12 : x
2. Step 2: Convert to fraction form
   30,648.32/45,945.12 = 13,109.12/x
3. Step 3: Cross multiply
   30,648.32x = 45,945.12 × 13,109.12
4. Step 4: Simplify right side
   30,648.32x = 602,300,091.49
5. Step 5: Solve for x
   x = 602,300,091.49/30,648.32
6. Step 6: Final answer
   x = 19,651.98