Finding the Fourth Proportional to 1,189,445.58, 1,641,390.98 and 645,569.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,445.58 : 1,641,390.98 = 645,569.69 : x
2. Step 2: Convert to fraction form
   1,189,445.58/1,641,390.98 = 645,569.69/x
3. Step 3: Cross multiply
   1,189,445.58x = 1,641,390.98 × 645,569.69
4. Step 4: Simplify right side
   1,189,445.58x = 1,059,632,254,692.59
5. Step 5: Solve for x
   x = 1,059,632,254,692.59/1,189,445.58
6. Step 6: Final answer
   x = 890,862.32