Finding the Fourth Proportional to 139.77, 192.83 and 100.89

Step by Step Solution

1. Step 1: Write the proportion equation
   139.77 : 192.83 = 100.89 : x
2. Step 2: Convert to fraction form
   139.77/192.83 = 100.89/x
3. Step 3: Cross multiply
   139.77x = 192.83 × 100.89
4. Step 4: Simplify right side
   139.77x = 19,454.11
5. Step 5: Solve for x
   x = 19,454.11/139.77
6. Step 6: Final answer
   x = 139.19