Finding the Fourth Proportional to 12,821.06, 17,692.83 and 7,155.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,821.06 : 17,692.83 = 7,155.70 : x
2. Step 2: Convert to fraction form
   12,821.06/17,692.83 = 7,155.70/x
3. Step 3: Cross multiply
   12,821.06x = 17,692.83 × 7,155.70
4. Step 4: Simplify right side
   12,821.06x = 126,604,663.80
5. Step 5: Solve for x
   x = 126,604,663.80/12,821.06
6. Step 6: Final answer
   x = 9,874.74