Finding the Fourth Proportional to 105.63, 145.61 and 83.46

Step by Step Solution

1. Step 1: Write the proportion equation
   105.63 : 145.61 = 83.46 : x
2. Step 2: Convert to fraction form
   105.63/145.61 = 83.46/x
3. Step 3: Cross multiply
   105.63x = 145.61 × 83.46
4. Step 4: Simplify right side
   105.63x = 12,152.51
5. Step 5: Solve for x
   x = 12,152.51/105.63
6. Step 6: Final answer
   x = 115.05