Finding the Fourth Proportional to 111.60, 153.81 and 83.93

Step by Step Solution

1. Step 1: Write the proportion equation
   111.60 : 153.81 = 83.93 : x
2. Step 2: Convert to fraction form
   111.60/153.81 = 83.93/x
3. Step 3: Cross multiply
   111.60x = 153.81 × 83.93
4. Step 4: Simplify right side
   111.60x = 12,908.50
5. Step 5: Solve for x
   x = 12,908.50/111.60
6. Step 6: Final answer
   x = 115.67