Finding the Fourth Proportional to 39,897.60, 55,057.96 and 21,994.27

Step by Step Solution

1. Step 1: Write the proportion equation
   39,897.60 : 55,057.96 = 21,994.27 : x
2. Step 2: Convert to fraction form
   39,897.60/55,057.96 = 21,994.27/x
3. Step 3: Cross multiply
   39,897.60x = 55,057.96 × 21,994.27
4. Step 4: Simplify right side
   39,897.60x = 1,210,959,527.74
5. Step 5: Solve for x
   x = 1,210,959,527.74/39,897.60
6. Step 6: Final answer
   x = 30,351.69