Finding the Fourth Proportional to 1,688.96, 2,332.72 and 1,128.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,688.96 : 2,332.72 = 1,128.48 : x
2. Step 2: Convert to fraction form
   1,688.96/2,332.72 = 1,128.48/x
3. Step 3: Cross multiply
   1,688.96x = 2,332.72 × 1,128.48
4. Step 4: Simplify right side
   1,688.96x = 2,632,427.87
5. Step 5: Solve for x
   x = 2,632,427.87/1,688.96
6. Step 6: Final answer
   x = 1,558.61