Finding the Fourth Proportional to 1,026.42, 1,415.52 and 986.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,026.42 : 1,415.52 = 986.46 : x
2. Step 2: Convert to fraction form
   1,026.42/1,415.52 = 986.46/x
3. Step 3: Cross multiply
   1,026.42x = 1,415.52 × 986.46
4. Step 4: Simplify right side
   1,026.42x = 1,396,353.86
5. Step 5: Solve for x
   x = 1,396,353.86/1,026.42
6. Step 6: Final answer
   x = 1,360.41