Finding the Fourth Proportional to 308,665.03, 465,311.05 and 288,090.15

Step by Step Solution

1. Step 1: Write the proportion equation
   308,665.03 : 465,311.05 = 288,090.15 : x
2. Step 2: Convert to fraction form
   308,665.03/465,311.05 = 288,090.15/x
3. Step 3: Cross multiply
   308,665.03x = 465,311.05 × 288,090.15
4. Step 4: Simplify right side
   308,665.03x = 134,051,530,191.16
5. Step 5: Solve for x
   x = 134,051,530,191.16/308,665.03
6. Step 6: Final answer
   x = 434,294.52