Finding the Fourth Proportional to 1,665.58, 2,298.47 and 919.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.58 : 2,298.47 = 919.61 : x
2. Step 2: Convert to fraction form
   1,665.58/2,298.47 = 919.61/x
3. Step 3: Cross multiply
   1,665.58x = 2,298.47 × 919.61
4. Step 4: Simplify right side
   1,665.58x = 2,113,679.91
5. Step 5: Solve for x
   x = 2,113,679.91/1,665.58
6. Step 6: Final answer
   x = 1,269.04