Finding the Fourth Proportional to 1,288,123.02, 1,932,009.57 and 489,605.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288,123.02 : 1,932,009.57 = 489,605.58 : x
2. Step 2: Convert to fraction form
   1,288,123.02/1,932,009.57 = 489,605.58/x
3. Step 3: Cross multiply
   1,288,123.02x = 1,932,009.57 × 489,605.58
4. Step 4: Simplify right side
   1,288,123.02x = 945,922,666,085.40
5. Step 5: Solve for x
   x = 945,922,666,085.40/1,288,123.02
6. Step 6: Final answer
   x = 734,341.87