Finding the Fourth Proportional to 1,407.04, 1,957.22 and 1,380.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.04 : 1,957.22 = 1,380.31 : x
2. Step 2: Convert to fraction form
   1,407.04/1,957.22 = 1,380.31/x
3. Step 3: Cross multiply
   1,407.04x = 1,957.22 × 1,380.31
4. Step 4: Simplify right side
   1,407.04x = 2,701,570.34
5. Step 5: Solve for x
   x = 2,701,570.34/1,407.04
6. Step 6: Final answer
   x = 1,920.04