Finding the Fourth Proportional to 1,225,401.72, 1,691,039.28 and 688,857.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225,401.72 : 1,691,039.28 = 688,857.72 : x
2. Step 2: Convert to fraction form
   1,225,401.72/1,691,039.28 = 688,857.72/x
3. Step 3: Cross multiply
   1,225,401.72x = 1,691,039.28 × 688,857.72
4. Step 4: Simplify right side
   1,225,401.72x = 1,164,885,462,851.24
5. Step 5: Solve for x
   x = 1,164,885,462,851.24/1,225,401.72
6. Step 6: Final answer
   x = 950,615.17