Finding the Fourth Proportional to 1,081,111.24, 1,491,685.99 and 645,443.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081,111.24 : 1,491,685.99 = 645,443.79 : x
2. Step 2: Convert to fraction form
   1,081,111.24/1,491,685.99 = 645,443.79/x
3. Step 3: Cross multiply
   1,081,111.24x = 1,491,685.99 × 645,443.79
4. Step 4: Simplify right side
   1,081,111.24x = 962,799,457,261.89
5. Step 5: Solve for x
   x = 962,799,457,261.89/1,081,111.24
6. Step 6: Final answer
   x = 890,564.66