Finding the Fourth Proportional to 71,111.91, 106,673.98 and 18,521.31

Step by Step Solution

1. Step 1: Write the proportion equation
   71,111.91 : 106,673.98 = 18,521.31 : x
2. Step 2: Convert to fraction form
   71,111.91/106,673.98 = 18,521.31/x
3. Step 3: Cross multiply
   71,111.91x = 106,673.98 × 18,521.31
4. Step 4: Simplify right side
   71,111.91x = 1,975,741,852.51
5. Step 5: Solve for x
   x = 1,975,741,852.51/71,111.91
6. Step 6: Final answer
   x = 27,783.56