Finding the Fourth Proportional to 514,422, 709,902.72 and 288,072.72

Step by Step Solution

1. Step 1: Write the proportion equation
   514,422 : 709,902.72 = 288,072.72 : x
2. Step 2: Convert to fraction form
   514,422/709,902.72 = 288,072.72/x
3. Step 3: Cross multiply
   514,422x = 709,902.72 × 288,072.72
4. Step 4: Simplify right side
   514,422x = 204,503,607,485.80
5. Step 5: Solve for x
   x = 204,503,607,485.80/514,422
6. Step 6: Final answer
   x = 397,540.56