Finding the Fourth Proportional to 139.93, 210.71 and 101.67

Step by Step Solution

1. Step 1: Write the proportion equation
   139.93 : 210.71 = 101.67 : x
2. Step 2: Convert to fraction form
   139.93/210.71 = 101.67/x
3. Step 3: Cross multiply
   139.93x = 210.71 × 101.67
4. Step 4: Simplify right side
   139.93x = 21,422.89
5. Step 5: Solve for x
   x = 21,422.89/139.93
6. Step 6: Final answer
   x = 153.10