Finding the Fourth Proportional to 1,149,680.88, 1,586,608.56 and 640,383.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,149,680.88 : 1,586,608.56 = 640,383.48 : x
2. Step 2: Convert to fraction form
   1,149,680.88/1,586,608.56 = 640,383.48/x
3. Step 3: Cross multiply
   1,149,680.88x = 1,586,608.56 × 640,383.48
4. Step 4: Simplify right side
   1,149,680.88x = 1,016,037,911,050.59
5. Step 5: Solve for x
   x = 1,016,037,911,050.59/1,149,680.88
6. Step 6: Final answer
   x = 883,756.47