Finding the Fourth Proportional to 142,485, 196,623.36 and 78,818.76

Step by Step Solution

1. Step 1: Write the proportion equation
   142,485 : 196,623.36 = 78,818.76 : x
2. Step 2: Convert to fraction form
   142,485/196,623.36 = 78,818.76/x
3. Step 3: Cross multiply
   142,485x = 196,623.36 × 78,818.76
4. Step 4: Simplify right side
   142,485x = 15,497,609,422.23
5. Step 5: Solve for x
   x = 15,497,609,422.23/142,485
6. Step 6: Final answer
   x = 108,766.60