Finding the Fourth Proportional to 885,404.40, 1,321,200.99 and 789,978.60

Step by Step Solution

1. Step 1: Write the proportion equation
   885,404.40 : 1,321,200.99 = 789,978.60 : x
2. Step 2: Convert to fraction form
   885,404.40/1,321,200.99 = 789,978.60/x
3. Step 3: Cross multiply
   885,404.40x = 1,321,200.99 × 789,978.60
4. Step 4: Simplify right side
   885,404.40x = 1,043,720,508,398.81
5. Step 5: Solve for x
   x = 1,043,720,508,398.81/885,404.40
6. Step 6: Final answer
   x = 1,178,806.55