Finding the Fourth Proportional to 1,411.42, 1,945.73 and 990.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.42 : 1,945.73 = 990.47 : x
2. Step 2: Convert to fraction form
   1,411.42/1,945.73 = 990.47/x
3. Step 3: Cross multiply
   1,411.42x = 1,945.73 × 990.47
4. Step 4: Simplify right side
   1,411.42x = 1,927,172.51
5. Step 5: Solve for x
   x = 1,927,172.51/1,411.42
6. Step 6: Final answer
   x = 1,365.42