Finding the Fourth Proportional to 1,238.96, 1,709.52 and 715.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.96 : 1,709.52 = 715.16 : x
2. Step 2: Convert to fraction form
   1,238.96/1,709.52 = 715.16/x
3. Step 3: Cross multiply
   1,238.96x = 1,709.52 × 715.16
4. Step 4: Simplify right side
   1,238.96x = 1,222,580.32
5. Step 5: Solve for x
   x = 1,222,580.32/1,238.96
6. Step 6: Final answer
   x = 986.78