Finding the Fourth Proportional to 1,128,379.89, 1,557,164.22 and 644,955.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128,379.89 : 1,557,164.22 = 644,955.42 : x
2. Step 2: Convert to fraction form
   1,128,379.89/1,557,164.22 = 644,955.42/x
3. Step 3: Cross multiply
   1,128,379.89x = 1,557,164.22 × 644,955.42
4. Step 4: Simplify right side
   1,128,379.89x = 1,004,301,503,519.07
5. Step 5: Solve for x
   x = 1,004,301,503,519.07/1,128,379.89
6. Step 6: Final answer
   x = 890,038.46