Finding the Fourth Proportional to 1,189,317.69, 1,641,259.27 and 645,453.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,317.69 : 1,641,259.27 = 645,453.34 : x
2. Step 2: Convert to fraction form
   1,189,317.69/1,641,259.27 = 645,453.34/x
3. Step 3: Cross multiply
   1,189,317.69x = 1,641,259.27 × 645,453.34
4. Step 4: Simplify right side
   1,189,317.69x = 1,059,356,277,627.46
5. Step 5: Solve for x
   x = 1,059,356,277,627.46/1,189,317.69
6. Step 6: Final answer
   x = 890,726.07