Finding the Fourth Proportional to 10,523, 15,786.12 and 3,128.18

Step by Step Solution

1. Step 1: Write the proportion equation
   10,523 : 15,786.12 = 3,128.18 : x
2. Step 2: Convert to fraction form
   10,523/15,786.12 = 3,128.18/x
3. Step 3: Cross multiply
   10,523x = 15,786.12 × 3,128.18
4. Step 4: Simplify right side
   10,523x = 49,381,824.86
5. Step 5: Solve for x
   x = 49,381,824.86/10,523
6. Step 6: Final answer
   x = 4,692.75