Finding the Fourth Proportional to 864,002.10, 1,296,003.15 and 391,610.10

Step by Step Solution

1. Step 1: Write the proportion equation
   864,002.10 : 1,296,003.15 = 391,610.10 : x
2. Step 2: Convert to fraction form
   864,002.10/1,296,003.15 = 391,610.10/x
3. Step 3: Cross multiply
   864,002.10x = 1,296,003.15 × 391,610.10
4. Step 4: Simplify right side
   864,002.10x = 507,527,923,171.82
5. Step 5: Solve for x
   x = 507,527,923,171.82/864,002.10
6. Step 6: Final answer
   x = 587,415.15