Finding the Fourth Proportional to 1,688.84, 2,514.34 and 1,680.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,688.84 : 2,514.34 = 1,680.72 : x
2. Step 2: Convert to fraction form
   1,688.84/2,514.34 = 1,680.72/x
3. Step 3: Cross multiply
   1,688.84x = 2,514.34 × 1,680.72
4. Step 4: Simplify right side
   1,688.84x = 4,225,901.52
5. Step 5: Solve for x
   x = 4,225,901.52/1,688.84
6. Step 6: Final answer
   x = 2,502.25