Finding the Fourth Proportional to 1,435.57, 1,980.27 and 992.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.57 : 1,980.27 = 992.71 : x
2. Step 2: Convert to fraction form
   1,435.57/1,980.27 = 992.71/x
3. Step 3: Cross multiply
   1,435.57x = 1,980.27 × 992.71
4. Step 4: Simplify right side
   1,435.57x = 1,965,827.96
5. Step 5: Solve for x
   x = 1,965,827.96/1,435.57
6. Step 6: Final answer
   x = 1,369.37