Finding the Fourth Proportional to 980,766.63, 1,354,061.79 and 777,638.07

Step by Step Solution

1. Step 1: Write the proportion equation
   980,766.63 : 1,354,061.79 = 777,638.07 : x
2. Step 2: Convert to fraction form
   980,766.63/1,354,061.79 = 777,638.07/x
3. Step 3: Cross multiply
   980,766.63x = 1,354,061.79 × 777,638.07
4. Step 4: Simplify right side
   980,766.63x = 1,052,969,997,036.35
5. Step 5: Solve for x
   x = 1,052,969,997,036.35/980,766.63
6. Step 6: Final answer
   x = 1,073,619.31