Finding the Fourth Proportional to 1,071,426.24, 1,607,087.28 and 397,638.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071,426.24 : 1,607,087.28 = 397,638.88 : x
2. Step 2: Convert to fraction form
   1,071,426.24/1,607,087.28 = 397,638.88/x
3. Step 3: Cross multiply
   1,071,426.24x = 1,607,087.28 × 397,638.88
4. Step 4: Simplify right side
   1,071,426.24x = 639,040,386,081.45
5. Step 5: Solve for x
   x = 639,040,386,081.45/1,071,426.24
6. Step 6: Final answer
   x = 596,438.99