Finding the Fourth Proportional to 1,433,722.80, 1,978,521.80 and 789,129.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433,722.80 : 1,978,521.80 = 789,129.12 : x
2. Step 2: Convert to fraction form
   1,433,722.80/1,978,521.80 = 789,129.12/x
3. Step 3: Cross multiply
   1,433,722.80x = 1,978,521.80 × 789,129.12
4. Step 4: Simplify right side
   1,433,722.80x = 1,561,309,166,934.82
5. Step 5: Solve for x
   x = 1,561,309,166,934.82/1,433,722.80
6. Step 6: Final answer
   x = 1,088,989.56