Finding the Fourth Proportional to 142,712.81, 196,848.75 and 91,789.98

Step by Step Solution

1. Step 1: Write the proportion equation
   142,712.81 : 196,848.75 = 91,789.98 : x
2. Step 2: Convert to fraction form
   142,712.81/196,848.75 = 91,789.98/x
3. Step 3: Cross multiply
   142,712.81x = 196,848.75 × 91,789.98
4. Step 4: Simplify right side
   142,712.81x = 18,068,742,431.55
5. Step 5: Solve for x
   x = 18,068,742,431.55/142,712.81
6. Step 6: Final answer
   x = 126,609.12