Finding the Fourth Proportional to 142,314.50, 196,377 and 78,643.64

Step by Step Solution

1. Step 1: Write the proportion equation
   142,314.50 : 196,377 = 78,643.64 : x
2. Step 2: Convert to fraction form
   142,314.50/196,377 = 78,643.64/x
3. Step 3: Cross multiply
   142,314.50x = 196,377 × 78,643.64
4. Step 4: Simplify right side
   142,314.50x = 15,443,802,092.28
5. Step 5: Solve for x
   x = 15,443,802,092.28/142,314.50
6. Step 6: Final answer
   x = 108,518.82