Finding the Fourth Proportional to 12,157.76, 16,776.47 and 8,972.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,157.76 : 16,776.47 = 8,972.79 : x
2. Step 2: Convert to fraction form
   12,157.76/16,776.47 = 8,972.79/x
3. Step 3: Cross multiply
   12,157.76x = 16,776.47 × 8,972.79
4. Step 4: Simplify right side
   12,157.76x = 150,531,697.39
5. Step 5: Solve for x
   x = 150,531,697.39/12,157.76
6. Step 6: Final answer
   x = 12,381.54