Finding the Fourth Proportional to 101.43, 140.00 and 78.18

Step by Step Solution

1. Step 1: Write the proportion equation
   101.43 : 140.00 = 78.18 : x
2. Step 2: Convert to fraction form
   101.43/140.00 = 78.18/x
3. Step 3: Cross multiply
   101.43x = 140.00 × 78.18
4. Step 4: Simplify right side
   101.43x = 10,944.81
5. Step 5: Solve for x
   x = 10,944.81/101.43
6. Step 6: Final answer
   x = 107.91