Finding the Fourth Proportional to 1,392.84, 1,922.76 and 1,077.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.84 : 1,922.76 = 1,077.36 : x
2. Step 2: Convert to fraction form
   1,392.84/1,922.76 = 1,077.36/x
3. Step 3: Cross multiply
   1,392.84x = 1,922.76 × 1,077.36
4. Step 4: Simplify right side
   1,392.84x = 2,071,504.71
5. Step 5: Solve for x
   x = 2,071,504.71/1,392.84
6. Step 6: Final answer
   x = 1,487.25