Finding the Fourth Proportional to 155.98, 215.22 and 100.01

Step by Step Solution

1. Step 1: Write the proportion equation
   155.98 : 215.22 = 100.01 : x
2. Step 2: Convert to fraction form
   155.98/215.22 = 100.01/x
3. Step 3: Cross multiply
   155.98x = 215.22 × 100.01
4. Step 4: Simplify right side
   155.98x = 21,524.32
5. Step 5: Solve for x
   x = 21,524.32/155.98
6. Step 6: Final answer
   x = 138.00