Finding the Fourth Proportional to 99.63, 137.42 and 77.46

Step by Step Solution

1. Step 1: Write the proportion equation
   99.63 : 137.42 = 77.46 : x
2. Step 2: Convert to fraction form
   99.63/137.42 = 77.46/x
3. Step 3: Cross multiply
   99.63x = 137.42 × 77.46
4. Step 4: Simplify right side
   99.63x = 10,644.55
5. Step 5: Solve for x
   x = 10,644.55/99.63
6. Step 6: Final answer
   x = 106.84