Finding the Fourth Proportional to 1,128,567.42, 1,557,422.94 and 645,143.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128,567.42 : 1,557,422.94 = 645,143.37 : x
2. Step 2: Convert to fraction form
   1,128,567.42/1,557,422.94 = 645,143.37/x
3. Step 3: Cross multiply
   1,128,567.42x = 1,557,422.94 × 645,143.37
4. Step 4: Simplify right side
   1,128,567.42x = 1,004,761,084,026.91
5. Step 5: Solve for x
   x = 1,004,761,084,026.91/1,128,567.42
6. Step 6: Final answer
   x = 890,297.79