Finding the Fourth Proportional to 1,491.72, 2,238.74 and 711.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,491.72 : 2,238.74 = 711.99 : x
2. Step 2: Convert to fraction form
   1,491.72/2,238.74 = 711.99/x
3. Step 3: Cross multiply
   1,491.72x = 2,238.74 × 711.99
4. Step 4: Simplify right side
   1,491.72x = 1,593,959.60
5. Step 5: Solve for x
   x = 1,593,959.60/1,491.72
6. Step 6: Final answer
   x = 1,068.54