Finding the Fourth Proportional to 78.01, 116.99 and 65.83

Step by Step Solution

1. Step 1: Write the proportion equation
   78.01 : 116.99 = 65.83 : x
2. Step 2: Convert to fraction form
   78.01/116.99 = 65.83/x
3. Step 3: Cross multiply
   78.01x = 116.99 × 65.83
4. Step 4: Simplify right side
   78.01x = 7,701.45
5. Step 5: Solve for x
   x = 7,701.45/78.01
6. Step 6: Final answer
   x = 98.72