Finding the Fourth Proportional to 99.30, 136.98 and 77.52

Step by Step Solution

1. Step 1: Write the proportion equation
   99.30 : 136.98 = 77.52 : x
2. Step 2: Convert to fraction form
   99.30/136.98 = 77.52/x
3. Step 3: Cross multiply
   99.30x = 136.98 × 77.52
4. Step 4: Simplify right side
   99.30x = 10,618.69
5. Step 5: Solve for x
   x = 10,618.69/99.30
6. Step 6: Final answer
   x = 106.94