Finding the Fourth Proportional to 826,648.23, 1,140,638.72 and 487,070.31

Step by Step Solution

1. Step 1: Write the proportion equation
   826,648.23 : 1,140,638.72 = 487,070.31 : x
2. Step 2: Convert to fraction form
   826,648.23/1,140,638.72 = 487,070.31/x
3. Step 3: Cross multiply
   826,648.23x = 1,140,638.72 × 487,070.31
4. Step 4: Simplify right side
   826,648.23x = 555,571,252,513.05
5. Step 5: Solve for x
   x = 555,571,252,513.05/826,648.23
6. Step 6: Final answer
   x = 672,076.99