Finding the Fourth Proportional to 1,189,420.42, 1,641,401.72 and 645,556.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,420.42 : 1,641,401.72 = 645,556.14 : x
2. Step 2: Convert to fraction form
   1,189,420.42/1,641,401.72 = 645,556.14/x
3. Step 3: Cross multiply
   1,189,420.42x = 1,641,401.72 × 645,556.14
4. Step 4: Simplify right side
   1,189,420.42x = 1,059,616,961,480.04
5. Step 5: Solve for x
   x = 1,059,616,961,480.04/1,189,420.42
6. Step 6: Final answer
   x = 890,868.31