Finding the Fourth Proportional to 1,028,861.11, 1,419,356.55 and 666,401.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,028,861.11 : 1,419,356.55 = 666,401.50 : x
2. Step 2: Convert to fraction form
   1,028,861.11/1,419,356.55 = 666,401.50/x
3. Step 3: Cross multiply
   1,028,861.11x = 1,419,356.55 × 666,401.50
4. Step 4: Simplify right side
   1,028,861.11x = 945,861,333,954.83
5. Step 5: Solve for x
   x = 945,861,333,954.83/1,028,861.11
6. Step 6: Final answer
   x = 919,328.49