Finding the Fourth Proportional to 28,587.86, 42,717.98 and 21,796.09

Step by Step Solution

1. Step 1: Write the proportion equation
   28,587.86 : 42,717.98 = 21,796.09 : x
2. Step 2: Convert to fraction form
   28,587.86/42,717.98 = 21,796.09/x
3. Step 3: Cross multiply
   28,587.86x = 42,717.98 × 21,796.09
4. Step 4: Simplify right side
   28,587.86x = 931,084,936.70
5. Step 5: Solve for x
   x = 931,084,936.70/28,587.86
6. Step 6: Final answer
   x = 32,569.24