Finding the Fourth Proportional to 1,688.69, 2,328.86 and 1,059.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,688.69 : 2,328.86 = 1,059.28 : x
2. Step 2: Convert to fraction form
   1,688.69/2,328.86 = 1,059.28/x
3. Step 3: Cross multiply
   1,688.69x = 2,328.86 × 1,059.28
4. Step 4: Simplify right side
   1,688.69x = 2,466,911.65
5. Step 5: Solve for x
   x = 2,466,911.65/1,688.69
6. Step 6: Final answer
   x = 1,460.84