Finding the Fourth Proportional to 1,392.03, 1,921.01 and 786.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.03 : 1,921.01 = 786.38 : x
2. Step 2: Convert to fraction form
   1,392.03/1,921.01 = 786.38/x
3. Step 3: Cross multiply
   1,392.03x = 1,921.01 × 786.38
4. Step 4: Simplify right side
   1,392.03x = 1,510,643.84
5. Step 5: Solve for x
   x = 1,510,643.84/1,392.03
6. Step 6: Final answer
   x = 1,085.21