Finding the Fourth Proportional to 1,386.45, 1,912.05 and 914.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.45 : 1,912.05 = 914.01 : x
2. Step 2: Convert to fraction form
   1,386.45/1,912.05 = 914.01/x
3. Step 3: Cross multiply
   1,386.45x = 1,912.05 × 914.01
4. Step 4: Simplify right side
   1,386.45x = 1,747,632.82
5. Step 5: Solve for x
   x = 1,747,632.82/1,386.45
6. Step 6: Final answer
   x = 1,260.51