Finding the Fourth Proportional to 2,636.52, 3,953.78 and 992.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.52 : 3,953.78 = 992.18 : x
2. Step 2: Convert to fraction form
   2,636.52/3,953.78 = 992.18/x
3. Step 3: Cross multiply
   2,636.52x = 3,953.78 × 992.18
4. Step 4: Simplify right side
   2,636.52x = 3,922,861.44
5. Step 5: Solve for x
   x = 3,922,861.44/2,636.52
6. Step 6: Final answer
   x = 1,487.89