Finding the Fourth Proportional to 78.84, 108.71 and 61.32

Step by Step Solution

1. Step 1: Write the proportion equation
   78.84 : 108.71 = 61.32 : x
2. Step 2: Convert to fraction form
   78.84/108.71 = 61.32/x
3. Step 3: Cross multiply
   78.84x = 108.71 × 61.32
4. Step 4: Simplify right side
   78.84x = 6,665.79
5. Step 5: Solve for x
   x = 6,665.79/78.84
6. Step 6: Final answer
   x = 84.55