Finding the Fourth Proportional to 142,651.02, 196,861.50 and 78,123

Step by Step Solution

1. Step 1: Write the proportion equation
   142,651.02 : 196,861.50 = 78,123 : x
2. Step 2: Convert to fraction form
   142,651.02/196,861.50 = 78,123/x
3. Step 3: Cross multiply
   142,651.02x = 196,861.50 × 78,123
4. Step 4: Simplify right side
   142,651.02x = 15,379,410,964.50
5. Step 5: Solve for x
   x = 15,379,410,964.50/142,651.02
6. Step 6: Final answer
   x = 107,811.43