Finding the Fourth Proportional to 105.21, 156.88 and 105.01

Step by Step Solution

1. Step 1: Write the proportion equation
   105.21 : 156.88 = 105.01 : x
2. Step 2: Convert to fraction form
   105.21/156.88 = 105.01/x
3. Step 3: Cross multiply
   105.21x = 156.88 × 105.01
4. Step 4: Simplify right side
   105.21x = 16,473.71
5. Step 5: Solve for x
   x = 16,473.71/105.21
6. Step 6: Final answer
   x = 156.58