Finding the Fourth Proportional to 109.31, 150.86 and 70.50

Step by Step Solution

1. Step 1: Write the proportion equation
   109.31 : 150.86 = 70.50 : x
2. Step 2: Convert to fraction form
   109.31/150.86 = 70.50/x
3. Step 3: Cross multiply
   109.31x = 150.86 × 70.50
4. Step 4: Simplify right side
   109.31x = 10,635.28
5. Step 5: Solve for x
   x = 10,635.28/109.31
6. Step 6: Final answer
   x = 97.29