Finding the Fourth Proportional to 1,665.65, 2,298.61 and 909.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.65 : 2,298.61 = 909.43 : x
2. Step 2: Convert to fraction form
   1,665.65/2,298.61 = 909.43/x
3. Step 3: Cross multiply
   1,665.65x = 2,298.61 × 909.43
4. Step 4: Simplify right side
   1,665.65x = 2,090,420.35
5. Step 5: Solve for x
   x = 2,090,420.35/1,665.65
6. Step 6: Final answer
   x = 1,255.02