Finding the Fourth Proportional to 100.49, 150.78 and 69.98

Step by Step Solution

1. Step 1: Write the proportion equation
   100.49 : 150.78 = 69.98 : x
2. Step 2: Convert to fraction form
   100.49/150.78 = 69.98/x
3. Step 3: Cross multiply
   100.49x = 150.78 × 69.98
4. Step 4: Simplify right side
   100.49x = 10,551.58
5. Step 5: Solve for x
   x = 10,551.58/100.49
6. Step 6: Final answer
   x = 105.00