Finding the Fourth Proportional to 1,665.42, 2,298.34 and 919.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.42 : 2,298.34 = 919.50 : x
2. Step 2: Convert to fraction form
   1,665.42/2,298.34 = 919.50/x
3. Step 3: Cross multiply
   1,665.42x = 2,298.34 × 919.50
4. Step 4: Simplify right side
   1,665.42x = 2,113,323.63
5. Step 5: Solve for x
   x = 2,113,323.63/1,665.42
6. Step 6: Final answer
   x = 1,268.94