Finding the Fourth Proportional to 1,681.74, 2,520.72 and 708.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,681.74 : 2,520.72 = 708.12 : x
2. Step 2: Convert to fraction form
   1,681.74/2,520.72 = 708.12/x
3. Step 3: Cross multiply
   1,681.74x = 2,520.72 × 708.12
4. Step 4: Simplify right side
   1,681.74x = 1,784,972.25
5. Step 5: Solve for x
   x = 1,784,972.25/1,681.74
6. Step 6: Final answer
   x = 1,061.38