Finding the Fourth Proportional to 2,612,601.20, 3,919,047.72 and 815,732.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,612,601.20 : 3,919,047.72 = 815,732.72 : x
2. Step 2: Convert to fraction form
   2,612,601.20/3,919,047.72 = 815,732.72/x
3. Step 3: Cross multiply
   2,612,601.20x = 3,919,047.72 × 815,732.72
4. Step 4: Simplify right side
   2,612,601.20x = 3,196,895,456,445.40
5. Step 5: Solve for x
   x = 3,196,895,456,445.40/2,612,601.20
6. Step 6: Final answer
   x = 1,223,644.64