Finding the Fourth Proportional to 815,984.01, 1,215,774.72 and 770,146.31

Step by Step Solution

1. Step 1: Write the proportion equation
   815,984.01 : 1,215,774.72 = 770,146.31 : x
2. Step 2: Convert to fraction form
   815,984.01/1,215,774.72 = 770,146.31/x
3. Step 3: Cross multiply
   815,984.01x = 1,215,774.72 × 770,146.31
4. Step 4: Simplify right side
   815,984.01x = 936,324,417,438.72
5. Step 5: Solve for x
   x = 936,324,417,438.72/815,984.01
6. Step 6: Final answer
   x = 1,147,478.88