Finding the Fourth Proportional to 2,039.61, 2,814.72 and 1,242.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,039.61 : 2,814.72 = 1,242.98 : x
2. Step 2: Convert to fraction form
   2,039.61/2,814.72 = 1,242.98/x
3. Step 3: Cross multiply
   2,039.61x = 2,814.72 × 1,242.98
4. Step 4: Simplify right side
   2,039.61x = 3,498,632.49
5. Step 5: Solve for x
   x = 3,498,632.49/2,039.61
6. Step 6: Final answer
   x = 1,715.34