Finding the Fourth Proportional to 21,789.60, 32,618.31 and 19,710.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,789.60 : 32,618.31 = 19,710.48 : x
2. Step 2: Convert to fraction form
   21,789.60/32,618.31 = 19,710.48/x
3. Step 3: Cross multiply
   21,789.60x = 32,618.31 × 19,710.48
4. Step 4: Simplify right side
   21,789.60x = 642,922,546.89
5. Step 5: Solve for x
   x = 642,922,546.89/21,789.60
6. Step 6: Final answer
   x = 29,505.94