Finding the Fourth Proportional to 89.72, 123.83 and 50.91

Step by Step Solution

1. Step 1: Write the proportion equation
   89.72 : 123.83 = 50.91 : x
2. Step 2: Convert to fraction form
   89.72/123.83 = 50.91/x
3. Step 3: Cross multiply
   89.72x = 123.83 × 50.91
4. Step 4: Simplify right side
   89.72x = 6,303.66
5. Step 5: Solve for x
   x = 6,303.66/89.72
6. Step 6: Final answer
   x = 70.26