Finding the Fourth Proportional to 2,087.86, 3,131.82 and 992.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.86 : 3,131.82 = 992.34 : x
2. Step 2: Convert to fraction form
   2,087.86/3,131.82 = 992.34/x
3. Step 3: Cross multiply
   2,087.86x = 3,131.82 × 992.34
4. Step 4: Simplify right side
   2,087.86x = 3,107,830.26
5. Step 5: Solve for x
   x = 3,107,830.26/2,087.86
6. Step 6: Final answer
   x = 1,488.52