Finding the Fourth Proportional to 1,688.85, 2,528.82 and 1,227.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,688.85 : 2,528.82 = 1,227.69 : x
2. Step 2: Convert to fraction form
   1,688.85/2,528.82 = 1,227.69/x
3. Step 3: Cross multiply
   1,688.85x = 2,528.82 × 1,227.69
4. Step 4: Simplify right side
   1,688.85x = 3,104,607.03
5. Step 5: Solve for x
   x = 3,104,607.03/1,688.85
6. Step 6: Final answer
   x = 1,838.30