Finding the Fourth Proportional to 686,005.29, 1,024,113.86 and 640,417.51

Step by Step Solution

1. Step 1: Write the proportion equation
   686,005.29 : 1,024,113.86 = 640,417.51 : x
2. Step 2: Convert to fraction form
   686,005.29/1,024,113.86 = 640,417.51/x
3. Step 3: Cross multiply
   686,005.29x = 1,024,113.86 × 640,417.51
4. Step 4: Simplify right side
   686,005.29x = 655,860,443,616.10
5. Step 5: Solve for x
   x = 655,860,443,616.10/686,005.29
6. Step 6: Final answer
   x = 956,057.42