Finding the Fourth Proportional to 21,059.60, 31,579.56 and 7,729.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,059.60 : 31,579.56 = 7,729.29 : x
2. Step 2: Convert to fraction form
   21,059.60/31,579.56 = 7,729.29/x
3. Step 3: Cross multiply
   21,059.60x = 31,579.56 × 7,729.29
4. Step 4: Simplify right side
   21,059.60x = 244,087,577.31
5. Step 5: Solve for x
   x = 244,087,577.31/21,059.60
6. Step 6: Final answer
   x = 11,590.33