Finding the Fourth Proportional to 88.17, 131.94 and 78.18

Step by Step Solution

1. Step 1: Write the proportion equation
   88.17 : 131.94 = 78.18 : x
2. Step 2: Convert to fraction form
   88.17/131.94 = 78.18/x
3. Step 3: Cross multiply
   88.17x = 131.94 × 78.18
4. Step 4: Simplify right side
   88.17x = 10,315.07
5. Step 5: Solve for x
   x = 10,315.07/88.17
6. Step 6: Final answer
   x = 116.99