Finding the Fourth Proportional to 1,189,316.69, 1,641,257.89 and 645,452.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,316.69 : 1,641,257.89 = 645,452.34 : x
2. Step 2: Convert to fraction form
   1,189,316.69/1,641,257.89 = 645,452.34/x
3. Step 3: Cross multiply
   1,189,316.69x = 1,641,257.89 × 645,452.34
4. Step 4: Simplify right side
   1,189,316.69x = 1,059,353,745,643.96
5. Step 5: Solve for x
   x = 1,059,353,745,643.96/1,189,316.69
6. Step 6: Final answer
   x = 890,724.69