Finding the Fourth Proportional to 1,401,145.20, 2,101,719.69 and 390,270.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401,145.20 : 2,101,719.69 = 390,270.06 : x
2. Step 2: Convert to fraction form
   1,401,145.20/2,101,719.69 = 390,270.06/x
3. Step 3: Cross multiply
   1,401,145.20x = 2,101,719.69 × 390,270.06
4. Step 4: Simplify right side
   1,401,145.20x = 820,238,269,519.48
5. Step 5: Solve for x
   x = 820,238,269,519.48/1,401,145.20
6. Step 6: Final answer
   x = 585,405.62