Finding the Fourth Proportional to 525,711.72, 725,724.35 and 307,890.09

Step by Step Solution

1. Step 1: Write the proportion equation
   525,711.72 : 725,724.35 = 307,890.09 : x
2. Step 2: Convert to fraction form
   525,711.72/725,724.35 = 307,890.09/x
3. Step 3: Cross multiply
   525,711.72x = 725,724.35 × 307,890.09
4. Step 4: Simplify right side
   525,711.72x = 223,443,335,436.69
5. Step 5: Solve for x
   x = 223,443,335,436.69/525,711.72
6. Step 6: Final answer
   x = 425,030.16