Finding the Fourth Proportional to 1,392.08, 1,921.10 and 762.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.08 : 1,921.10 = 762.63 : x
2. Step 2: Convert to fraction form
   1,392.08/1,921.10 = 762.63/x
3. Step 3: Cross multiply
   1,392.08x = 1,921.10 × 762.63
4. Step 4: Simplify right side
   1,392.08x = 1,465,087.54
5. Step 5: Solve for x
   x = 1,465,087.54/1,392.08
6. Step 6: Final answer
   x = 1,052.45