Finding the Fourth Proportional to 99.51, 137.61 and 74.94

Step by Step Solution

1. Step 1: Write the proportion equation
   99.51 : 137.61 = 74.94 : x
2. Step 2: Convert to fraction form
   99.51/137.61 = 74.94/x
3. Step 3: Cross multiply
   99.51x = 137.61 × 74.94
4. Step 4: Simplify right side
   99.51x = 10,312.49
5. Step 5: Solve for x
   x = 10,312.49/99.51
6. Step 6: Final answer
   x = 103.63