Finding the Fourth Proportional to 27,276.82, 37,478.89 and 21,678.10

Step by Step Solution

1. Step 1: Write the proportion equation
   27,276.82 : 37,478.89 = 21,678.10 : x
2. Step 2: Convert to fraction form
   27,276.82/37,478.89 = 21,678.10/x
3. Step 3: Cross multiply
   27,276.82x = 37,478.89 × 21,678.10
4. Step 4: Simplify right side
   27,276.82x = 812,471,016.92
5. Step 5: Solve for x
   x = 812,471,016.92/27,276.82
6. Step 6: Final answer
   x = 29,786.13