Finding the Fourth Proportional to 1,138.32, 1,570.73 and 696.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,138.32 : 1,570.73 = 696.15 : x
2. Step 2: Convert to fraction form
   1,138.32/1,570.73 = 696.15/x
3. Step 3: Cross multiply
   1,138.32x = 1,570.73 × 696.15
4. Step 4: Simplify right side
   1,138.32x = 1,093,460.21
5. Step 5: Solve for x
   x = 1,093,460.21/1,138.32
6. Step 6: Final answer
   x = 960.59