Finding the Fourth Proportional to 99.50, 137.31 and 55.84

Step by Step Solution

1. Step 1: Write the proportion equation
   99.50 : 137.31 = 55.84 : x
2. Step 2: Convert to fraction form
   99.50/137.31 = 55.84/x
3. Step 3: Cross multiply
   99.50x = 137.31 × 55.84
4. Step 4: Simplify right side
   99.50x = 7,667.39
5. Step 5: Solve for x
   x = 7,667.39/99.50
6. Step 6: Final answer
   x = 77.06