Finding the Fourth Proportional to 12,978.45, 19,457.69 and 8,807.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.45 : 19,457.69 = 8,807.49 : x
2. Step 2: Convert to fraction form
   12,978.45/19,457.69 = 8,807.49/x
3. Step 3: Cross multiply
   12,978.45x = 19,457.69 × 8,807.49
4. Step 4: Simplify right side
   12,978.45x = 171,373,366.06
5. Step 5: Solve for x
   x = 171,373,366.06/12,978.45
6. Step 6: Final answer
   x = 13,204.46