Finding the Fourth Proportional to 1,433,721.84, 1,978,520.46 and 789,128.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433,721.84 : 1,978,520.46 = 789,128.16 : x
2. Step 2: Convert to fraction form
   1,433,721.84/1,978,520.46 = 789,128.16/x
3. Step 3: Cross multiply
   1,433,721.84x = 1,978,520.46 × 789,128.16
4. Step 4: Simplify right side
   1,433,721.84x = 1,561,306,210,122.15
5. Step 5: Solve for x
   x = 1,561,306,210,122.15/1,433,721.84
6. Step 6: Final answer
   x = 1,088,988.23