Finding the Fourth Proportional to 99.50, 137.38 and 74.98

Step by Step Solution

1. Step 1: Write the proportion equation
   99.50 : 137.38 = 74.98 : x
2. Step 2: Convert to fraction form
   99.50/137.38 = 74.98/x
3. Step 3: Cross multiply
   99.50x = 137.38 × 74.98
4. Step 4: Simplify right side
   99.50x = 10,300.75
5. Step 5: Solve for x
   x = 10,300.75/99.50
6. Step 6: Final answer
   x = 103.53