Finding the Fourth Proportional to 1,231,984.37, 1,700,120.25 and 688,128.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,231,984.37 : 1,700,120.25 = 688,128.09 : x
2. Step 2: Convert to fraction form
   1,231,984.37/1,700,120.25 = 688,128.09/x
3. Step 3: Cross multiply
   1,231,984.37x = 1,700,120.25 × 688,128.09
4. Step 4: Simplify right side
   1,231,984.37x = 1,169,900,500,402.82
5. Step 5: Solve for x
   x = 1,169,900,500,402.82/1,231,984.37
6. Step 6: Final answer
   x = 949,606.61