Finding the Fourth Proportional to 2,078,756.75, 3,118,142.34 and 639,430.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078,756.75 : 3,118,142.34 = 639,430.38 : x
2. Step 2: Convert to fraction form
   2,078,756.75/3,118,142.34 = 639,430.38/x
3. Step 3: Cross multiply
   2,078,756.75x = 3,118,142.34 × 639,430.38
4. Step 4: Simplify right side
   2,078,756.75x = 1,993,834,941,360.29
5. Step 5: Solve for x
   x = 1,993,834,941,360.29/2,078,756.75
6. Step 6: Final answer
   x = 959,147.79