Finding the Fourth Proportional to 39,056.58, 58,578.48 and 10,978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   39,056.58 : 58,578.48 = 10,978.56 : x
2. Step 2: Convert to fraction form
   39,056.58/58,578.48 = 10,978.56/x
3. Step 3: Cross multiply
   39,056.58x = 58,578.48 × 10,978.56
4. Step 4: Simplify right side
   39,056.58x = 643,107,357.39
5. Step 5: Solve for x
   x = 643,107,357.39/39,056.58
6. Step 6: Final answer
   x = 16,466.04