Finding the Fourth Proportional to 915,798, 1,263,801.24 and 513,390

Step by Step Solution

1. Step 1: Write the proportion equation
   915,798 : 1,263,801.24 = 513,390 : x
2. Step 2: Convert to fraction form
   915,798/1,263,801.24 = 513,390/x
3. Step 3: Cross multiply
   915,798x = 1,263,801.24 × 513,390
4. Step 4: Simplify right side
   915,798x = 648,822,918,603.60
5. Step 5: Solve for x
   x = 648,822,918,603.60/915,798
6. Step 6: Final answer
   x = 708,478.20