Finding the Fourth Proportional to 2,636.42, 3,951.93 and 991.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.42 : 3,951.93 = 991.82 : x
2. Step 2: Convert to fraction form
   2,636.42/3,951.93 = 991.82/x
3. Step 3: Cross multiply
   2,636.42x = 3,951.93 × 991.82
4. Step 4: Simplify right side
   2,636.42x = 3,919,603.21
5. Step 5: Solve for x
   x = 3,919,603.21/2,636.42
6. Step 6: Final answer
   x = 1,486.71