Finding the Fourth Proportional to 1,360.40, 1,878.12 and 986.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,360.40 : 1,878.12 = 986.99 : x
2. Step 2: Convert to fraction form
   1,360.40/1,878.12 = 986.99/x
3. Step 3: Cross multiply
   1,360.40x = 1,878.12 × 986.99
4. Step 4: Simplify right side
   1,360.40x = 1,853,676.27
5. Step 5: Solve for x
   x = 1,853,676.27/1,360.40
6. Step 6: Final answer
   x = 1,362.60