Finding the Fourth Proportional to 39,899.42, 55,060.52 and 21,996.09

Step by Step Solution

1. Step 1: Write the proportion equation
   39,899.42 : 55,060.52 = 21,996.09 : x
2. Step 2: Convert to fraction form
   39,899.42/55,060.52 = 21,996.09/x
3. Step 3: Cross multiply
   39,899.42x = 55,060.52 × 21,996.09
4. Step 4: Simplify right side
   39,899.42x = 1,211,116,153.37
5. Step 5: Solve for x
   x = 1,211,116,153.37/39,899.42
6. Step 6: Final answer
   x = 30,354.23