Finding the Fourth Proportional to 1,707.86, 2,350.72 and 1,209.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,707.86 : 2,350.72 = 1,209.63 : x
2. Step 2: Convert to fraction form
   1,707.86/2,350.72 = 1,209.63/x
3. Step 3: Cross multiply
   1,707.86x = 2,350.72 × 1,209.63
4. Step 4: Simplify right side
   1,707.86x = 2,843,501.43
5. Step 5: Solve for x
   x = 2,843,501.43/1,707.86
6. Step 6: Final answer
   x = 1,664.95