Finding the Fourth Proportional to 69.91, 104.78 and 29.31

Step by Step Solution

1. Step 1: Write the proportion equation
   69.91 : 104.78 = 29.31 : x
2. Step 2: Convert to fraction form
   69.91/104.78 = 29.31/x
3. Step 3: Cross multiply
   69.91x = 104.78 × 29.31
4. Step 4: Simplify right side
   69.91x = 3,070.96
5. Step 5: Solve for x
   x = 3,070.96/69.91
6. Step 6: Final answer
   x = 43.93