Finding the Fourth Proportional to 3,914.16, 5,870.70 and 992.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,914.16 : 5,870.70 = 992.31 : x
2. Step 2: Convert to fraction form
   3,914.16/5,870.70 = 992.31/x
3. Step 3: Cross multiply
   3,914.16x = 5,870.70 × 992.31
4. Step 4: Simplify right side
   3,914.16x = 5,825,554.32
5. Step 5: Solve for x
   x = 5,825,554.32/3,914.16
6. Step 6: Final answer
   x = 1,488.33