Finding the Fourth Proportional to 142,290.07, 196,353.92 and 78,626.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,290.07 : 196,353.92 = 78,626.50 : x
2. Step 2: Convert to fraction form
   142,290.07/196,353.92 = 78,626.50/x
3. Step 3: Cross multiply
   142,290.07x = 196,353.92 × 78,626.50
4. Step 4: Simplify right side
   142,290.07x = 15,438,621,196.56
5. Step 5: Solve for x
   x = 15,438,621,196.56/142,290.07
6. Step 6: Final answer
   x = 108,501.05