Finding the Fourth Proportional to 142,642.53, 196,852.83 and 78,980.31

Step by Step Solution

1. Step 1: Write the proportion equation
   142,642.53 : 196,852.83 = 78,980.31 : x
2. Step 2: Convert to fraction form
   142,642.53/196,852.83 = 78,980.31/x
3. Step 3: Cross multiply
   142,642.53x = 196,852.83 × 78,980.31
4. Step 4: Simplify right side
   142,642.53x = 15,547,497,537.78
5. Step 5: Solve for x
   x = 15,547,497,537.78/142,642.53
6. Step 6: Final answer
   x = 108,996.23