Finding the Fourth Proportional to 1,128,683.72, 1,557,628.46 and 619,404.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128,683.72 : 1,557,628.46 = 619,404.32 : x
2. Step 2: Convert to fraction form
   1,128,683.72/1,557,628.46 = 619,404.32/x
3. Step 3: Cross multiply
   1,128,683.72x = 1,557,628.46 × 619,404.32
4. Step 4: Simplify right side
   1,128,683.72x = 964,801,797,078.95
5. Step 5: Solve for x
   x = 964,801,797,078.95/1,128,683.72
6. Step 6: Final answer
   x = 854,802.62