Finding the Fourth Proportional to 1,669.31, 2,505.48 and 889.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,669.31 : 2,505.48 = 889.98 : x
2. Step 2: Convert to fraction form
   1,669.31/2,505.48 = 889.98/x
3. Step 3: Cross multiply
   1,669.31x = 2,505.48 × 889.98
4. Step 4: Simplify right side
   1,669.31x = 2,229,827.09
5. Step 5: Solve for x
   x = 2,229,827.09/1,669.31
6. Step 6: Final answer
   x = 1,335.78