Finding the Fourth Proportional to 142,443.18, 196,568.22 and 78,779.64

Step by Step Solution

1. Step 1: Write the proportion equation
   142,443.18 : 196,568.22 = 78,779.64 : x
2. Step 2: Convert to fraction form
   142,443.18/196,568.22 = 78,779.64/x
3. Step 3: Cross multiply
   142,443.18x = 196,568.22 × 78,779.64
4. Step 4: Simplify right side
   142,443.18x = 15,485,573,607.04
5. Step 5: Solve for x
   x = 15,485,573,607.04/142,443.18
6. Step 6: Final answer
   x = 108,714.04