Finding the Fourth Proportional to 1,288,533.18, 1,779,065.46 and 805,315.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288,533.18 : 1,779,065.46 = 805,315.54 : x
2. Step 2: Convert to fraction form
   1,288,533.18/1,779,065.46 = 805,315.54/x
3. Step 3: Cross multiply
   1,288,533.18x = 1,779,065.46 × 805,315.54
4. Step 4: Simplify right side
   1,288,533.18x = 1,432,709,061,615.25
5. Step 5: Solve for x
   x = 1,432,709,061,615.25/1,288,533.18
6. Step 6: Final answer
   x = 1,111,891.48