Finding the Fourth Proportional to 139.01, 191.85 and 89.85

Step by Step Solution

1. Step 1: Write the proportion equation
   139.01 : 191.85 = 89.85 : x
2. Step 2: Convert to fraction form
   139.01/191.85 = 89.85/x
3. Step 3: Cross multiply
   139.01x = 191.85 × 89.85
4. Step 4: Simplify right side
   139.01x = 17,238.61
5. Step 5: Solve for x
   x = 17,238.61/139.01
6. Step 6: Final answer
   x = 124.01