Finding the Fourth Proportional to 191.72, 287.56 and 69.98

Step by Step Solution

1. Step 1: Write the proportion equation
   191.72 : 287.56 = 69.98 : x
2. Step 2: Convert to fraction form
   191.72/287.56 = 69.98/x
3. Step 3: Cross multiply
   191.72x = 287.56 × 69.98
4. Step 4: Simplify right side
   191.72x = 20,123.45
5. Step 5: Solve for x
   x = 20,123.45/191.72
6. Step 6: Final answer
   x = 104.96