Finding the Fourth Proportional to 709,031.03, 978,465.90 and 386,748.05

Step by Step Solution

1. Step 1: Write the proportion equation
   709,031.03 : 978,465.90 = 386,748.05 : x
2. Step 2: Convert to fraction form
   709,031.03/978,465.90 = 386,748.05/x
3. Step 3: Cross multiply
   709,031.03x = 978,465.90 × 386,748.05
4. Step 4: Simplify right side
   709,031.03x = 378,419,778,816.50
5. Step 5: Solve for x
   x = 378,419,778,816.50/709,031.03
6. Step 6: Final answer
   x = 533,713.99