Finding the Fourth Proportional to 865,514.10, 1,298,271.15 and 510,698.10

Step by Step Solution

1. Step 1: Write the proportion equation
   865,514.10 : 1,298,271.15 = 510,698.10 : x
2. Step 2: Convert to fraction form
   865,514.10/1,298,271.15 = 510,698.10/x
3. Step 3: Cross multiply
   865,514.10x = 1,298,271.15 × 510,698.10
4. Step 4: Simplify right side
   865,514.10x = 663,024,609,589.82
5. Step 5: Solve for x
   x = 663,024,609,589.82/865,514.10
6. Step 6: Final answer
   x = 766,047.15