Finding the Fourth Proportional to 1,123,606.74, 1,685,578.18 and 413,580.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123,606.74 : 1,685,578.18 = 413,580.72 : x
2. Step 2: Convert to fraction form
   1,123,606.74/1,685,578.18 = 413,580.72/x
3. Step 3: Cross multiply
   1,123,606.74x = 1,685,578.18 × 413,580.72
4. Step 4: Simplify right side
   1,123,606.74x = 697,122,637,300.69
5. Step 5: Solve for x
   x = 697,122,637,300.69/1,123,606.74
6. Step 6: Final answer
   x = 620,432.94