Finding the Fourth Proportional to 28,456.06, 42,673.15 and 19,664.32

Step by Step Solution

1. Step 1: Write the proportion equation
   28,456.06 : 42,673.15 = 19,664.32 : x
2. Step 2: Convert to fraction form
   28,456.06/42,673.15 = 19,664.32/x
3. Step 3: Cross multiply
   28,456.06x = 42,673.15 × 19,664.32
4. Step 4: Simplify right side
   28,456.06x = 839,138,477.01
5. Step 5: Solve for x
   x = 839,138,477.01/28,456.06
6. Step 6: Final answer
   x = 29,488.92