Finding the Fourth Proportional to 123.99, 185.89 and 78.27

Step by Step Solution

1. Step 1: Write the proportion equation
   123.99 : 185.89 = 78.27 : x
2. Step 2: Convert to fraction form
   123.99/185.89 = 78.27/x
3. Step 3: Cross multiply
   123.99x = 185.89 × 78.27
4. Step 4: Simplify right side
   123.99x = 14,549.61
5. Step 5: Solve for x
   x = 14,549.61/123.99
6. Step 6: Final answer
   x = 117.35