Finding the Fourth Proportional to 1,643,580.05, 2,268,096.89 and 918,433.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643,580.05 : 2,268,096.89 = 918,433.76 : x
2. Step 2: Convert to fraction form
   1,643,580.05/2,268,096.89 = 918,433.76/x
3. Step 3: Cross multiply
   1,643,580.05x = 2,268,096.89 × 918,433.76
4. Step 4: Simplify right side
   1,643,580.05x = 2,083,096,738,794.35
5. Step 5: Solve for x
   x = 2,083,096,738,794.35/1,643,580.05
6. Step 6: Final answer
   x = 1,267,414.23