Finding the Fourth Proportional to 99.82, 137.74 and 56.15

Step by Step Solution

1. Step 1: Write the proportion equation
   99.82 : 137.74 = 56.15 : x
2. Step 2: Convert to fraction form
   99.82/137.74 = 56.15/x
3. Step 3: Cross multiply
   99.82x = 137.74 × 56.15
4. Step 4: Simplify right side
   99.82x = 7,734.30
5. Step 5: Solve for x
   x = 7,734.30/99.82
6. Step 6: Final answer
   x = 77.48