Finding the Fourth Proportional to 19,851, 27,417.42 and 13,215.48

Step by Step Solution

1. Step 1: Write the proportion equation
   19,851 : 27,417.42 = 13,215.48 : x
2. Step 2: Convert to fraction form
   19,851/27,417.42 = 13,215.48/x
3. Step 3: Cross multiply
   19,851x = 27,417.42 × 13,215.48
4. Step 4: Simplify right side
   19,851x = 362,334,365.66
5. Step 5: Solve for x
   x = 362,334,365.66/19,851
6. Step 6: Final answer
   x = 18,252.70