Finding the Fourth Proportional to 39,477.78, 54,477.72 and 21,573.39

Step by Step Solution

1. Step 1: Write the proportion equation
   39,477.78 : 54,477.72 = 21,573.39 : x
2. Step 2: Convert to fraction form
   39,477.78/54,477.72 = 21,573.39/x
3. Step 3: Cross multiply
   39,477.78x = 54,477.72 × 21,573.39
4. Step 4: Simplify right side
   39,477.78x = 1,175,269,099.87
5. Step 5: Solve for x
   x = 1,175,269,099.87/39,477.78
6. Step 6: Final answer
   x = 29,770.39