Finding the Fourth Proportional to 1,110.31, 1,531.41 and 970.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,110.31 : 1,531.41 = 970.15 : x
2. Step 2: Convert to fraction form
   1,110.31/1,531.41 = 970.15/x
3. Step 3: Cross multiply
   1,110.31x = 1,531.41 × 970.15
4. Step 4: Simplify right side
   1,110.31x = 1,485,697.41
5. Step 5: Solve for x
   x = 1,485,697.41/1,110.31
6. Step 6: Final answer
   x = 1,338.09