Finding the Fourth Proportional to 1,128,670.72, 1,557,610.52 and 619,391.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128,670.72 : 1,557,610.52 = 619,391.32 : x
2. Step 2: Convert to fraction form
   1,128,670.72/1,557,610.52 = 619,391.32/x
3. Step 3: Cross multiply
   1,128,670.72x = 1,557,610.52 × 619,391.32
4. Step 4: Simplify right side
   1,128,670.72x = 964,770,436,028.69
5. Step 5: Solve for x
   x = 964,770,436,028.69/1,128,670.72
6. Step 6: Final answer
   x = 854,784.68