Finding the Fourth Proportional to 1,708.86, 2,358.35 and 1,288.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,708.86 : 2,358.35 = 1,288.47 : x
2. Step 2: Convert to fraction form
   1,708.86/2,358.35 = 1,288.47/x
3. Step 3: Cross multiply
   1,708.86x = 2,358.35 × 1,288.47
4. Step 4: Simplify right side
   1,708.86x = 3,038,663.22
5. Step 5: Solve for x
   x = 3,038,663.22/1,708.86
6. Step 6: Final answer
   x = 1,778.18