Finding the Fourth Proportional to 39,192.42, 54,085.46 and 21,287.42

Step by Step Solution

1. Step 1: Write the proportion equation
   39,192.42 : 54,085.46 = 21,287.42 : x
2. Step 2: Convert to fraction form
   39,192.42/54,085.46 = 21,287.42/x
3. Step 3: Cross multiply
   39,192.42x = 54,085.46 × 21,287.42
4. Step 4: Simplify right side
   39,192.42x = 1,151,339,902.91
5. Step 5: Solve for x
   x = 1,151,339,902.91/39,192.42
6. Step 6: Final answer
   x = 29,376.60