Finding the Fourth Proportional to 897,783.72, 1,238,971.40 and 489,907.94

Step by Step Solution

1. Step 1: Write the proportion equation
   897,783.72 : 1,238,971.40 = 489,907.94 : x
2. Step 2: Convert to fraction form
   897,783.72/1,238,971.40 = 489,907.94/x
3. Step 3: Cross multiply
   897,783.72x = 1,238,971.40 × 489,907.94
4. Step 4: Simplify right side
   897,783.72x = 606,981,917,648.52
5. Step 5: Solve for x
   x = 606,981,917,648.52/897,783.72
6. Step 6: Final answer
   x = 676,089.25