Finding the Fourth Proportional to 709,139.07, 978,572.18 and 403,172.30

Step by Step Solution

1. Step 1: Write the proportion equation
   709,139.07 : 978,572.18 = 403,172.30 : x
2. Step 2: Convert to fraction form
   709,139.07/978,572.18 = 403,172.30/x
3. Step 3: Cross multiply
   709,139.07x = 978,572.18 × 403,172.30
4. Step 4: Simplify right side
   709,139.07x = 394,533,189,617.89
5. Step 5: Solve for x
   x = 394,533,189,617.89/709,139.07
6. Step 6: Final answer
   x = 556,355.17