Finding the Fourth Proportional to 39,404.22, 54,378 and 21,499.60

Step by Step Solution

1. Step 1: Write the proportion equation
   39,404.22 : 54,378 = 21,499.60 : x
2. Step 2: Convert to fraction form
   39,404.22/54,378 = 21,499.60/x
3. Step 3: Cross multiply
   39,404.22x = 54,378 × 21,499.60
4. Step 4: Simplify right side
   39,404.22x = 1,169,105,112.86
5. Step 5: Solve for x
   x = 1,169,105,112.86/39,404.22
6. Step 6: Final answer
   x = 29,669.54