Finding the Fourth Proportional to 142,082.78, 196,075.86 and 78,420.62

Step by Step Solution

1. Step 1: Write the proportion equation
   142,082.78 : 196,075.86 = 78,420.62 : x
2. Step 2: Convert to fraction form
   142,082.78/196,075.86 = 78,420.62/x
3. Step 3: Cross multiply
   142,082.78x = 196,075.86 × 78,420.62
4. Step 4: Simplify right side
   142,082.78x = 15,376,390,704.35
5. Step 5: Solve for x
   x = 15,376,390,704.35/142,082.78
6. Step 6: Final answer
   x = 108,221.36