Finding the Fourth Proportional to 99.61, 137.37 and 76.25

Step by Step Solution

1. Step 1: Write the proportion equation
   99.61 : 137.37 = 76.25 : x
2. Step 2: Convert to fraction form
   99.61/137.37 = 76.25/x
3. Step 3: Cross multiply
   99.61x = 137.37 × 76.25
4. Step 4: Simplify right side
   99.61x = 10,474.46
5. Step 5: Solve for x
   x = 10,474.46/99.61
6. Step 6: Final answer
   x = 105.16