Finding the Fourth Proportional to 85.91, 128.84 and 59.00

Step by Step Solution

1. Step 1: Write the proportion equation
   85.91 : 128.84 = 59.00 : x
2. Step 2: Convert to fraction form
   85.91/128.84 = 59.00/x
3. Step 3: Cross multiply
   85.91x = 128.84 × 59.00
4. Step 4: Simplify right side
   85.91x = 7,600.62
5. Step 5: Solve for x
   x = 7,600.62/85.91
6. Step 6: Final answer
   x = 88.48