Finding the Fourth Proportional to 1,185.70, 1,636.50 and 713.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.70 : 1,636.50 = 713.98 : x
2. Step 2: Convert to fraction form
   1,185.70/1,636.50 = 713.98/x
3. Step 3: Cross multiply
   1,185.70x = 1,636.50 × 713.98
4. Step 4: Simplify right side
   1,185.70x = 1,168,428.27
5. Step 5: Solve for x
   x = 1,168,428.27/1,185.70
6. Step 6: Final answer
   x = 985.43