Finding the Fourth Proportional to 2,078,756.87, 3,118,142.53 and 639,430.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078,756.87 : 3,118,142.53 = 639,430.52 : x
2. Step 2: Convert to fraction form
   2,078,756.87/3,118,142.53 = 639,430.52/x
3. Step 3: Cross multiply
   2,078,756.87x = 3,118,142.53 × 639,430.52
4. Step 4: Simplify right side
   2,078,756.87x = 1,993,835,499,392.02
5. Step 5: Solve for x
   x = 1,993,835,499,392.02/2,078,756.87
6. Step 6: Final answer
   x = 959,148.00