Finding the Fourth Proportional to 39,897.94, 55,059.16 and 21,993.34

Step by Step Solution

1. Step 1: Write the proportion equation
   39,897.94 : 55,059.16 = 21,993.34 : x
2. Step 2: Convert to fraction form
   39,897.94/55,059.16 = 21,993.34/x
3. Step 3: Cross multiply
   39,897.94x = 55,059.16 × 21,993.34
4. Step 4: Simplify right side
   39,897.94x = 1,210,934,825.99
5. Step 5: Solve for x
   x = 1,210,934,825.99/39,897.94
6. Step 6: Final answer
   x = 30,350.81