Finding the Fourth Proportional to 28,076.16, 42,116.48 and 16,390.56

Step by Step Solution

1. Step 1: Write the proportion equation
   28,076.16 : 42,116.48 = 16,390.56 : x
2. Step 2: Convert to fraction form
   28,076.16/42,116.48 = 16,390.56/x
3. Step 3: Cross multiply
   28,076.16x = 42,116.48 × 16,390.56
4. Step 4: Simplify right side
   28,076.16x = 690,312,692.43
5. Step 5: Solve for x
   x = 690,312,692.43/28,076.16
6. Step 6: Final answer
   x = 24,587.15