Finding the Fourth Proportional to 1,360.40, 1,876.20 and 1,011.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,360.40 : 1,876.20 = 1,011.92 : x
2. Step 2: Convert to fraction form
   1,360.40/1,876.20 = 1,011.92/x
3. Step 3: Cross multiply
   1,360.40x = 1,876.20 × 1,011.92
4. Step 4: Simplify right side
   1,360.40x = 1,898,564.30
5. Step 5: Solve for x
   x = 1,898,564.30/1,360.40
6. Step 6: Final answer
   x = 1,395.59