Finding the Fourth Proportional to 1,200,485.89, 1,656,683.38 and 656,610.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200,485.89 : 1,656,683.38 = 656,610.05 : x
2. Step 2: Convert to fraction form
   1,200,485.89/1,656,683.38 = 656,610.05/x
3. Step 3: Cross multiply
   1,200,485.89x = 1,656,683.38 × 656,610.05
4. Step 4: Simplify right side
   1,200,485.89x = 1,087,794,956,975.97
5. Step 5: Solve for x
   x = 1,087,794,956,975.97/1,200,485.89
6. Step 6: Final answer
   x = 906,128.90