Finding the Fourth Proportional to 1,387.95, 1,914.15 and 946.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.95 : 1,914.15 = 946.45 : x
2. Step 2: Convert to fraction form
   1,387.95/1,914.15 = 946.45/x
3. Step 3: Cross multiply
   1,387.95x = 1,914.15 × 946.45
4. Step 4: Simplify right side
   1,387.95x = 1,811,647.27
5. Step 5: Solve for x
   x = 1,811,647.27/1,387.95
6. Step 6: Final answer
   x = 1,305.27