Finding the Fourth Proportional to 142,307.27, 196,388.10 and 77,780.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142,307.27 : 196,388.10 = 77,780.10 : x
2. Step 2: Convert to fraction form
   142,307.27/196,388.10 = 77,780.10/x
3. Step 3: Cross multiply
   142,307.27x = 196,388.10 × 77,780.10
4. Step 4: Simplify right side
   142,307.27x = 15,275,086,056.81
5. Step 5: Solve for x
   x = 15,275,086,056.81/142,307.27
6. Step 6: Final answer
   x = 107,338.76