Finding the Fourth Proportional to 1,315,804.83, 1,972,116.81 and 640,874.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315,804.83 : 1,972,116.81 = 640,874.76 : x
2. Step 2: Convert to fraction form
   1,315,804.83/1,972,116.81 = 640,874.76/x
3. Step 3: Cross multiply
   1,315,804.83x = 1,972,116.81 × 640,874.76
4. Step 4: Simplify right side
   1,315,804.83x = 1,263,879,887,300.72
5. Step 5: Solve for x
   x = 1,263,879,887,300.72/1,315,804.83
6. Step 6: Final answer
   x = 960,537.50