Finding the Fourth Proportional to 142,307.56, 196,367.34 and 78,636.64

Step by Step Solution

1. Step 1: Write the proportion equation
   142,307.56 : 196,367.34 = 78,636.64 : x
2. Step 2: Convert to fraction form
   142,307.56/196,367.34 = 78,636.64/x
3. Step 3: Cross multiply
   142,307.56x = 196,367.34 × 78,636.64
4. Step 4: Simplify right side
   142,307.56x = 15,441,667,823.34
5. Step 5: Solve for x
   x = 15,441,667,823.34/142,307.56
6. Step 6: Final answer
   x = 108,509.12