Finding the Fourth Proportional to 1,411.76, 1,948.63 and 992.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.76 : 1,948.63 = 992.21 : x
2. Step 2: Convert to fraction form
   1,411.76/1,948.63 = 992.21/x
3. Step 3: Cross multiply
   1,411.76x = 1,948.63 × 992.21
4. Step 4: Simplify right side
   1,411.76x = 1,933,450.17
5. Step 5: Solve for x
   x = 1,933,450.17/1,411.76
6. Step 6: Final answer
   x = 1,369.53