Finding the Fourth Proportional to 71,016.71, 106,506.63 and 21,085.07

Step by Step Solution

1. Step 1: Write the proportion equation
   71,016.71 : 106,506.63 = 21,085.07 : x
2. Step 2: Convert to fraction form
   71,016.71/106,506.63 = 21,085.07/x
3. Step 3: Cross multiply
   71,016.71x = 106,506.63 × 21,085.07
4. Step 4: Simplify right side
   71,016.71x = 2,245,699,216.48
5. Step 5: Solve for x
   x = 2,245,699,216.48/71,016.71
6. Step 6: Final answer
   x = 31,622.13