Finding the Fourth Proportional to 142,597.56, 196,776.18 and 78,931.56

Step by Step Solution

1. Step 1: Write the proportion equation
   142,597.56 : 196,776.18 = 78,931.56 : x
2. Step 2: Convert to fraction form
   142,597.56/196,776.18 = 78,931.56/x
3. Step 3: Cross multiply
   142,597.56x = 196,776.18 × 78,931.56
4. Step 4: Simplify right side
   142,597.56x = 15,531,850,858.24
5. Step 5: Solve for x
   x = 15,531,850,858.24/142,597.56
6. Step 6: Final answer
   x = 108,920.87