Finding the Fourth Proportional to 499,403.48, 748,316.27 and 405,449.96

Step by Step Solution

1. Step 1: Write the proportion equation
   499,403.48 : 748,316.27 = 405,449.96 : x
2. Step 2: Convert to fraction form
   499,403.48/748,316.27 = 405,449.96/x
3. Step 3: Cross multiply
   499,403.48x = 748,316.27 × 405,449.96
4. Step 4: Simplify right side
   499,403.48x = 303,404,799,010.89
5. Step 5: Solve for x
   x = 303,404,799,010.89/499,403.48
6. Step 6: Final answer
   x = 607,534.42