Finding the Fourth Proportional to 142,140.90, 196,157.50 and 78,482.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,140.90 : 196,157.50 = 78,482.72 : x
2. Step 2: Convert to fraction form
   142,140.90/196,157.50 = 78,482.72/x
3. Step 3: Cross multiply
   142,140.90x = 196,157.50 × 78,482.72
4. Step 4: Simplify right side
   142,140.90x = 15,394,974,148.40
5. Step 5: Solve for x
   x = 15,394,974,148.40/142,140.90
6. Step 6: Final answer
   x = 108,307.84