Finding the Fourth Proportional to 2,612,786.31, 3,918,799.31 and 815,251.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,612,786.31 : 3,918,799.31 = 815,251.59 : x
2. Step 2: Convert to fraction form
   2,612,786.31/3,918,799.31 = 815,251.59/x
3. Step 3: Cross multiply
   2,612,786.31x = 3,918,799.31 × 815,251.59
4. Step 4: Simplify right side
   2,612,786.31x = 3,194,807,364,292.15
5. Step 5: Solve for x
   x = 3,194,807,364,292.15/2,612,786.31
6. Step 6: Final answer
   x = 1,222,758.77