Finding the Fourth Proportional to 709,109.01, 978,569.21 and 386,819.10

Step by Step Solution

1. Step 1: Write the proportion equation
   709,109.01 : 978,569.21 = 386,819.10 : x
2. Step 2: Convert to fraction form
   709,109.01/978,569.21 = 386,819.10/x
3. Step 3: Cross multiply
   709,109.01x = 978,569.21 × 386,819.10
4. Step 4: Simplify right side
   709,109.01x = 378,529,259,165.82
5. Step 5: Solve for x
   x = 378,529,259,165.82/709,109.01
6. Step 6: Final answer
   x = 533,809.69