Finding the Fourth Proportional to 2,639,644, 3,642,708.72 and 1,432,420

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639,644 : 3,642,708.72 = 1,432,420 : x
2. Step 2: Convert to fraction form
   2,639,644/3,642,708.72 = 1,432,420/x
3. Step 3: Cross multiply
   2,639,644x = 3,642,708.72 × 1,432,420
4. Step 4: Simplify right side
   2,639,644x = 5,217,888,824,702.40
5. Step 5: Solve for x
   x = 5,217,888,824,702.40/2,639,644
6. Step 6: Final answer
   x = 1,976,739.60