Finding the Fourth Proportional to 957,189.57, 1,320,904.56 and 521,610.72

Step by Step Solution

1. Step 1: Write the proportion equation
   957,189.57 : 1,320,904.56 = 521,610.72 : x
2. Step 2: Convert to fraction form
   957,189.57/1,320,904.56 = 521,610.72/x
3. Step 3: Cross multiply
   957,189.57x = 1,320,904.56 × 521,610.72
4. Step 4: Simplify right side
   957,189.57x = 688,997,978,592.88
5. Step 5: Solve for x
   x = 688,997,978,592.88/957,189.57
6. Step 6: Final answer
   x = 719,813.50