Finding the Fourth Proportional to 143,408.63, 197,908.71 and 78,880.55

Step by Step Solution

1. Step 1: Write the proportion equation
   143,408.63 : 197,908.71 = 78,880.55 : x
2. Step 2: Convert to fraction form
   143,408.63/197,908.71 = 78,880.55/x
3. Step 3: Cross multiply
   143,408.63x = 197,908.71 × 78,880.55
4. Step 4: Simplify right side
   143,408.63x = 15,611,147,894.59
5. Step 5: Solve for x
   x = 15,611,147,894.59/143,408.63
6. Step 6: Final answer
   x = 108,857.80