Finding the Fourth Proportional to 1,200,327.18, 1,798,650.15 and 815,586.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200,327.18 : 1,798,650.15 = 815,586.05 : x
2. Step 2: Convert to fraction form
   1,200,327.18/1,798,650.15 = 815,586.05/x
3. Step 3: Cross multiply
   1,200,327.18x = 1,798,650.15 × 815,586.05
4. Step 4: Simplify right side
   1,200,327.18x = 1,466,953,962,177.16
5. Step 5: Solve for x
   x = 1,466,953,962,177.16/1,200,327.18
6. Step 6: Final answer
   x = 1,222,128.42