Finding the Fourth Proportional to 900,317.89, 1,242,300.64 and 518,270.83

Step by Step Solution

1. Step 1: Write the proportion equation
   900,317.89 : 1,242,300.64 = 518,270.83 : x
2. Step 2: Convert to fraction form
   900,317.89/1,242,300.64 = 518,270.83/x
3. Step 3: Cross multiply
   900,317.89x = 1,242,300.64 × 518,270.83
4. Step 4: Simplify right side
   900,317.89x = 643,848,183,802.33
5. Step 5: Solve for x
   x = 643,848,183,802.33/900,317.89
6. Step 6: Final answer
   x = 715,134.28