Finding the Fourth Proportional to 21,116.56, 29,128.14 and 13,946.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,116.56 : 29,128.14 = 13,946.50 : x
2. Step 2: Convert to fraction form
   21,116.56/29,128.14 = 13,946.50/x
3. Step 3: Cross multiply
   21,116.56x = 29,128.14 × 13,946.50
4. Step 4: Simplify right side
   21,116.56x = 406,235,604.51
5. Step 5: Solve for x
   x = 406,235,604.51/21,116.56
6. Step 6: Final answer
   x = 19,237.77