Finding the Fourth Proportional to 2,078,820.99, 3,118,239.15 and 639,494.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078,820.99 : 3,118,239.15 = 639,494.42 : x
2. Step 2: Convert to fraction form
   2,078,820.99/3,118,239.15 = 639,494.42/x
3. Step 3: Cross multiply
   2,078,820.99x = 3,118,239.15 × 639,494.42
4. Step 4: Simplify right side
   2,078,820.99x = 1,994,096,521,059.35
5. Step 5: Solve for x
   x = 1,994,096,521,059.35/2,078,820.99
6. Step 6: Final answer
   x = 959,243.98