Finding the Fourth Proportional to 123.47, 170.32 and 76.83

Step by Step Solution

1. Step 1: Write the proportion equation
   123.47 : 170.32 = 76.83 : x
2. Step 2: Convert to fraction form
   123.47/170.32 = 76.83/x
3. Step 3: Cross multiply
   123.47x = 170.32 × 76.83
4. Step 4: Simplify right side
   123.47x = 13,084.83
5. Step 5: Solve for x
   x = 13,084.83/123.47
6. Step 6: Final answer
   x = 105.98