Finding the Fourth Proportional to 1,208.34, 1,667.57 and 710.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.34 : 1,667.57 = 710.91 : x
2. Step 2: Convert to fraction form
   1,208.34/1,667.57 = 710.91/x
3. Step 3: Cross multiply
   1,208.34x = 1,667.57 × 710.91
4. Step 4: Simplify right side
   1,208.34x = 1,185,488.63
5. Step 5: Solve for x
   x = 1,185,488.63/1,208.34
6. Step 6: Final answer
   x = 981.09