Finding the Fourth Proportional to 139.90, 209.83 and 37.18

Step by Step Solution

1. Step 1: Write the proportion equation
   139.90 : 209.83 = 37.18 : x
2. Step 2: Convert to fraction form
   139.90/209.83 = 37.18/x
3. Step 3: Cross multiply
   139.90x = 209.83 × 37.18
4. Step 4: Simplify right side
   139.90x = 7,801.48
5. Step 5: Solve for x
   x = 7,801.48/139.90
6. Step 6: Final answer
   x = 55.76