Finding the Fourth Proportional to 89.19, 133.02 and 78.93

Step by Step Solution

1. Step 1: Write the proportion equation
   89.19 : 133.02 = 78.93 : x
2. Step 2: Convert to fraction form
   89.19/133.02 = 78.93/x
3. Step 3: Cross multiply
   89.19x = 133.02 × 78.93
4. Step 4: Simplify right side
   89.19x = 10,499.27
5. Step 5: Solve for x
   x = 10,499.27/89.19
6. Step 6: Final answer
   x = 117.72