Finding the Fourth Proportional to 1,386.06, 1,911.30 and 1,071.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.06 : 1,911.30 = 1,071.37 : x
2. Step 2: Convert to fraction form
   1,386.06/1,911.30 = 1,071.37/x
3. Step 3: Cross multiply
   1,386.06x = 1,911.30 × 1,071.37
4. Step 4: Simplify right side
   1,386.06x = 2,047,707.85
5. Step 5: Solve for x
   x = 2,047,707.85/1,386.06
6. Step 6: Final answer
   x = 1,477.36