Finding the Fourth Proportional to 113.98, 156.90 and 100.10

Step by Step Solution

1. Step 1: Write the proportion equation
   113.98 : 156.90 = 100.10 : x
2. Step 2: Convert to fraction form
   113.98/156.90 = 100.10/x
3. Step 3: Cross multiply
   113.98x = 156.90 × 100.10
4. Step 4: Simplify right side
   113.98x = 15,705.69
5. Step 5: Solve for x
   x = 15,705.69/113.98
6. Step 6: Final answer
   x = 137.79