Finding the Fourth Proportional to 40,914, 61,380.72 and 13,212

Step by Step Solution

1. Step 1: Write the proportion equation
   40,914 : 61,380.72 = 13,212 : x
2. Step 2: Convert to fraction form
   40,914/61,380.72 = 13,212/x
3. Step 3: Cross multiply
   40,914x = 61,380.72 × 13,212
4. Step 4: Simplify right side
   40,914x = 810,962,072.64
5. Step 5: Solve for x
   x = 810,962,072.64/40,914
6. Step 6: Final answer
   x = 19,821.14