Finding the Fourth Proportional to 1,028,856.78, 1,419,897.15 and 621,057.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,028,856.78 : 1,419,897.15 = 621,057.96 : x
2. Step 2: Convert to fraction form
   1,028,856.78/1,419,897.15 = 621,057.96/x
3. Step 3: Cross multiply
   1,028,856.78x = 1,419,897.15 × 621,057.96
4. Step 4: Simplify right side
   1,028,856.78x = 881,838,427,388.81
5. Step 5: Solve for x
   x = 881,838,427,388.81/1,028,856.78
6. Step 6: Final answer
   x = 857,105.13