Finding the Fourth Proportional to 142,354.72, 196,434.48 and 78,682.24

Step by Step Solution

1. Step 1: Write the proportion equation
   142,354.72 : 196,434.48 = 78,682.24 : x
2. Step 2: Convert to fraction form
   142,354.72/196,434.48 = 78,682.24/x
3. Step 3: Cross multiply
   142,354.72x = 196,434.48 × 78,682.24
4. Step 4: Simplify right side
   142,354.72x = 15,455,904,899.64
5. Step 5: Solve for x
   x = 15,455,904,899.64/142,354.72
6. Step 6: Final answer
   x = 108,573.18