Finding the Fourth Proportional to 1,015.22, 1,407.56 and 981.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.22 : 1,407.56 = 981.05 : x
2. Step 2: Convert to fraction form
   1,015.22/1,407.56 = 981.05/x
3. Step 3: Cross multiply
   1,015.22x = 1,407.56 × 981.05
4. Step 4: Simplify right side
   1,015.22x = 1,380,886.74
5. Step 5: Solve for x
   x = 1,380,886.74/1,015.22
6. Step 6: Final answer
   x = 1,360.18