Finding the Fourth Proportional to 957,192.57, 1,320,908.72 and 521,613.72

Step by Step Solution

1. Step 1: Write the proportion equation
   957,192.57 : 1,320,908.72 = 521,613.72 : x
2. Step 2: Convert to fraction form
   957,192.57/1,320,908.72 = 521,613.72/x
3. Step 3: Cross multiply
   957,192.57x = 1,320,908.72 × 521,613.72
4. Step 4: Simplify right side
   957,192.57x = 689,004,108,611.57
5. Step 5: Solve for x
   x = 689,004,108,611.57/957,192.57
6. Step 6: Final answer
   x = 719,817.65