Finding the Fourth Proportional to 1,670.89, 2,509.18 and 1,392.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,670.89 : 2,509.18 = 1,392.96 : x
2. Step 2: Convert to fraction form
   1,670.89/2,509.18 = 1,392.96/x
3. Step 3: Cross multiply
   1,670.89x = 2,509.18 × 1,392.96
4. Step 4: Simplify right side
   1,670.89x = 3,495,187.37
5. Step 5: Solve for x
   x = 3,495,187.37/1,670.89
6. Step 6: Final answer
   x = 2,091.81