Finding the Fourth Proportional to 1,078,587.49, 1,488,989.62 and 670,820.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078,587.49 : 1,488,989.62 = 670,820.78 : x
2. Step 2: Convert to fraction form
   1,078,587.49/1,488,989.62 = 670,820.78/x
3. Step 3: Cross multiply
   1,078,587.49x = 1,488,989.62 × 670,820.78
4. Step 4: Simplify right side
   1,078,587.49x = 998,845,178,300.30
5. Step 5: Solve for x
   x = 998,845,178,300.30/1,078,587.49
6. Step 6: Final answer
   x = 926,067.83