Finding the Fourth Proportional to 12,901.78, 17,803.83 and 8,416.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,901.78 : 17,803.83 = 8,416.81 : x
2. Step 2: Convert to fraction form
   12,901.78/17,803.83 = 8,416.81/x
3. Step 3: Cross multiply
   12,901.78x = 17,803.83 × 8,416.81
4. Step 4: Simplify right side
   12,901.78x = 149,851,454.38
5. Step 5: Solve for x
   x = 149,851,454.38/12,901.78
6. Step 6: Final answer
   x = 11,614.79