Finding the Fourth Proportional to 99.34, 137.14 and 78.55

Step by Step Solution

1. Step 1: Write the proportion equation
   99.34 : 137.14 = 78.55 : x
2. Step 2: Convert to fraction form
   99.34/137.14 = 78.55/x
3. Step 3: Cross multiply
   99.34x = 137.14 × 78.55
4. Step 4: Simplify right side
   99.34x = 10,772.35
5. Step 5: Solve for x
   x = 10,772.35/99.34
6. Step 6: Final answer
   x = 108.44