Finding the Fourth Proportional to 525,513, 725,210.82 and 287,049

Step by Step Solution

1. Step 1: Write the proportion equation
   525,513 : 725,210.82 = 287,049 : x
2. Step 2: Convert to fraction form
   525,513/725,210.82 = 287,049/x
3. Step 3: Cross multiply
   525,513x = 725,210.82 × 287,049
4. Step 4: Simplify right side
   525,513x = 208,171,040,670.18
5. Step 5: Solve for x
   x = 208,171,040,670.18/525,513
6. Step 6: Final answer
   x = 396,129.19