Finding the Fourth Proportional to 915,274.88, 1,263,019.20 and 512,789.12

Step by Step Solution

1. Step 1: Write the proportion equation
   915,274.88 : 1,263,019.20 = 512,789.12 : x
2. Step 2: Convert to fraction form
   915,274.88/1,263,019.20 = 512,789.12/x
3. Step 3: Cross multiply
   915,274.88x = 1,263,019.20 × 512,789.12
4. Step 4: Simplify right side
   915,274.88x = 647,662,504,111.10
5. Step 5: Solve for x
   x = 647,662,504,111.10/915,274.88
6. Step 6: Final answer
   x = 707,615.29