Finding the Fourth Proportional to 105.59, 145.74 and 61.37

Step by Step Solution

1. Step 1: Write the proportion equation
   105.59 : 145.74 = 61.37 : x
2. Step 2: Convert to fraction form
   105.59/145.74 = 61.37/x
3. Step 3: Cross multiply
   105.59x = 145.74 × 61.37
4. Step 4: Simplify right side
   105.59x = 8,943.81
5. Step 5: Solve for x
   x = 8,943.81/105.59
6. Step 6: Final answer
   x = 84.70