Finding the Fourth Proportional to 1,705.88, 2,555.52 and 1,315.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,705.88 : 2,555.52 = 1,315.52 : x
2. Step 2: Convert to fraction form
   1,705.88/2,555.52 = 1,315.52/x
3. Step 3: Cross multiply
   1,705.88x = 2,555.52 × 1,315.52
4. Step 4: Simplify right side
   1,705.88x = 3,361,837.67
5. Step 5: Solve for x
   x = 3,361,837.67/1,705.88
6. Step 6: Final answer
   x = 1,970.74