Finding the Fourth Proportional to 1,612.89, 2,417.52 and 687.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,612.89 : 2,417.52 = 687.98 : x
2. Step 2: Convert to fraction form
   1,612.89/2,417.52 = 687.98/x
3. Step 3: Cross multiply
   1,612.89x = 2,417.52 × 687.98
4. Step 4: Simplify right side
   1,612.89x = 1,663,193.32
5. Step 5: Solve for x
   x = 1,663,193.32/1,612.89
6. Step 6: Final answer
   x = 1,031.19