Finding the Fourth Proportional to 525,709.72, 725,721.59 and 307,888.09

Step by Step Solution

1. Step 1: Write the proportion equation
   525,709.72 : 725,721.59 = 307,888.09 : x
2. Step 2: Convert to fraction form
   525,709.72/725,721.59 = 307,888.09/x
3. Step 3: Cross multiply
   525,709.72x = 725,721.59 × 307,888.09
4. Step 4: Simplify right side
   525,709.72x = 223,441,034,216.86
5. Step 5: Solve for x
   x = 223,441,034,216.86/525,709.72
6. Step 6: Final answer
   x = 425,027.40