Finding the Fourth Proportional to 28,516.58, 42,744.62 and 10,978.82

Step by Step Solution

1. Step 1: Write the proportion equation
   28,516.58 : 42,744.62 = 10,978.82 : x
2. Step 2: Convert to fraction form
   28,516.58/42,744.62 = 10,978.82/x
3. Step 3: Cross multiply
   28,516.58x = 42,744.62 × 10,978.82
4. Step 4: Simplify right side
   28,516.58x = 469,285,302.67
5. Step 5: Solve for x
   x = 469,285,302.67/28,516.58
6. Step 6: Final answer
   x = 16,456.58