Finding the Fourth Proportional to 1,321,087.28, 1,823,111.16 and 717,479.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321,087.28 : 1,823,111.16 = 717,479.60 : x
2. Step 2: Convert to fraction form
   1,321,087.28/1,823,111.16 = 717,479.60/x
3. Step 3: Cross multiply
   1,321,087.28x = 1,823,111.16 × 717,479.60
4. Step 4: Simplify right side
   1,321,087.28x = 1,308,045,065,832.34
5. Step 5: Solve for x
   x = 1,308,045,065,832.34/1,321,087.28
6. Step 6: Final answer
   x = 990,127.67