Finding the Fourth Proportional to 777,892.50, 1,073,491.65 and 420,196.50

Step by Step Solution

1. Step 1: Write the proportion equation
   777,892.50 : 1,073,491.65 = 420,196.50 : x
2. Step 2: Convert to fraction form
   777,892.50/1,073,491.65 = 420,196.50/x
3. Step 3: Cross multiply
   777,892.50x = 1,073,491.65 × 420,196.50
4. Step 4: Simplify right side
   777,892.50x = 451,077,434,109.23
5. Step 5: Solve for x
   x = 451,077,434,109.23/777,892.50
6. Step 6: Final answer
   x = 579,871.17