Finding the Fourth Proportional to 777,796.50, 1,073,359.90 and 420,100.50

Step by Step Solution

1. Step 1: Write the proportion equation
   777,796.50 : 1,073,359.90 = 420,100.50 : x
2. Step 2: Convert to fraction form
   777,796.50/1,073,359.90 = 420,100.50/x
3. Step 3: Cross multiply
   777,796.50x = 1,073,359.90 × 420,100.50
4. Step 4: Simplify right side
   777,796.50x = 450,919,030,669.95
5. Step 5: Solve for x
   x = 450,919,030,669.95/777,796.50
6. Step 6: Final answer
   x = 579,739.08