Finding the Fourth Proportional to 12,156.76, 16,776.12 and 7,123.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,156.76 : 16,776.12 = 7,123.54 : x
2. Step 2: Convert to fraction form
   12,156.76/16,776.12 = 7,123.54/x
3. Step 3: Cross multiply
   12,156.76x = 16,776.12 × 7,123.54
4. Step 4: Simplify right side
   12,156.76x = 119,505,361.86
5. Step 5: Solve for x
   x = 119,505,361.86/12,156.76
6. Step 6: Final answer
   x = 9,830.36