Finding the Fourth Proportional to 19,789.68, 29,641.34 and 9,911.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,789.68 : 29,641.34 = 9,911.72 : x
2. Step 2: Convert to fraction form
   19,789.68/29,641.34 = 9,911.72/x
3. Step 3: Cross multiply
   19,789.68x = 29,641.34 × 9,911.72
4. Step 4: Simplify right side
   19,789.68x = 293,796,662.50
5. Step 5: Solve for x
   x = 293,796,662.50/19,789.68
6. Step 6: Final answer
   x = 14,845.95