Finding the Fourth Proportional to 1,128,426.10, 1,557,229.89 and 619,132.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128,426.10 : 1,557,229.89 = 619,132.12 : x
2. Step 2: Convert to fraction form
   1,128,426.10/1,557,229.89 = 619,132.12/x
3. Step 3: Cross multiply
   1,128,426.10x = 1,557,229.89 × 619,132.12
4. Step 4: Simplify right side
   1,128,426.10x = 964,131,043,123.07
5. Step 5: Solve for x
   x = 964,131,043,123.07/1,128,426.10
6. Step 6: Final answer
   x = 854,403.35