Finding the Fourth Proportional to 142,140.51, 196,152.59 and 78,478.76

Step by Step Solution

1. Step 1: Write the proportion equation
   142,140.51 : 196,152.59 = 78,478.76 : x
2. Step 2: Convert to fraction form
   142,140.51/196,152.59 = 78,478.76/x
3. Step 3: Cross multiply
   142,140.51x = 196,152.59 × 78,478.76
4. Step 4: Simplify right side
   142,140.51x = 15,393,810,660.83
5. Step 5: Solve for x
   x = 15,393,810,660.83/142,140.51
6. Step 6: Final answer
   x = 108,299.95