Finding the Fourth Proportional to 1,988.27, 2,744.72 and 1,242.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,988.27 : 2,744.72 = 1,242.71 : x
2. Step 2: Convert to fraction form
   1,988.27/2,744.72 = 1,242.71/x
3. Step 3: Cross multiply
   1,988.27x = 2,744.72 × 1,242.71
4. Step 4: Simplify right side
   1,988.27x = 3,410,890.99
5. Step 5: Solve for x
   x = 3,410,890.99/1,988.27
6. Step 6: Final answer
   x = 1,715.51