Finding the Fourth Proportional to 865,664.10, 1,298,496.15 and 510,848.10

Step by Step Solution

1. Step 1: Write the proportion equation
   865,664.10 : 1,298,496.15 = 510,848.10 : x
2. Step 2: Convert to fraction form
   865,664.10/1,298,496.15 = 510,848.10/x
3. Step 3: Cross multiply
   865,664.10x = 1,298,496.15 × 510,848.10
4. Step 4: Simplify right side
   865,664.10x = 663,334,291,084.82
5. Step 5: Solve for x
   x = 663,334,291,084.82/865,664.10
6. Step 6: Final answer
   x = 766,272.15