Finding the Fourth Proportional to 1,666.89, 2,300.31 and 1,003.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,666.89 : 2,300.31 = 1,003.91 : x
2. Step 2: Convert to fraction form
   1,666.89/2,300.31 = 1,003.91/x
3. Step 3: Cross multiply
   1,666.89x = 2,300.31 × 1,003.91
4. Step 4: Simplify right side
   1,666.89x = 2,309,292.71
5. Step 5: Solve for x
   x = 2,309,292.71/1,666.89
6. Step 6: Final answer
   x = 1,385.39