Finding the Fourth Proportional to 2,640,221, 3,959,697.18 and 1,218,911.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640,221 : 3,959,697.18 = 1,218,911.56 : x
2. Step 2: Convert to fraction form
   2,640,221/3,959,697.18 = 1,218,911.56/x
3. Step 3: Cross multiply
   2,640,221x = 3,959,697.18 × 1,218,911.56
4. Step 4: Simplify right side
   2,640,221x = 4,826,520,666,801.40
5. Step 5: Solve for x
   x = 4,826,520,666,801.40/2,640,221
6. Step 6: Final answer
   x = 1,828,074.49