Finding the Fourth Proportional to 142,292.22, 196,375.68 and 78,642.31

Step by Step Solution

1. Step 1: Write the proportion equation
   142,292.22 : 196,375.68 = 78,642.31 : x
2. Step 2: Convert to fraction form
   142,292.22/196,375.68 = 78,642.31/x
3. Step 3: Cross multiply
   142,292.22x = 196,375.68 × 78,642.31
4. Step 4: Simplify right side
   142,292.22x = 15,443,437,103.02
5. Step 5: Solve for x
   x = 15,443,437,103.02/142,292.22
6. Step 6: Final answer
   x = 108,533.25