Finding the Fourth Proportional to 1,231,978.51, 1,700,112.42 and 688,122.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,231,978.51 : 1,700,112.42 = 688,122.03 : x
2. Step 2: Convert to fraction form
   1,231,978.51/1,700,112.42 = 688,122.03/x
3. Step 3: Cross multiply
   1,231,978.51x = 1,700,112.42 × 688,122.03
4. Step 4: Simplify right side
   1,231,978.51x = 1,169,884,809,678.61
5. Step 5: Solve for x
   x = 1,169,884,809,678.61/1,231,978.51
6. Step 6: Final answer
   x = 949,598.39