Finding the Fourth Proportional to 1,123,138.10, 1,685,002.70 and 403,552.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123,138.10 : 1,685,002.70 = 403,552.53 : x
2. Step 2: Convert to fraction form
   1,123,138.10/1,685,002.70 = 403,552.53/x
3. Step 3: Cross multiply
   1,123,138.10x = 1,685,002.70 × 403,552.53
4. Step 4: Simplify right side
   1,123,138.10x = 679,987,103,650.71
5. Step 5: Solve for x
   x = 679,987,103,650.71/1,123,138.10
6. Step 6: Final answer
   x = 605,434.99