Finding the Fourth Proportional to 864,012.10, 1,296,018.15 and 785,280.10

Step by Step Solution

1. Step 1: Write the proportion equation
   864,012.10 : 1,296,018.15 = 785,280.10 : x
2. Step 2: Convert to fraction form
   864,012.10/1,296,018.15 = 785,280.10/x
3. Step 3: Cross multiply
   864,012.10x = 1,296,018.15 × 785,280.10
4. Step 4: Simplify right side
   864,012.10x = 1,017,737,262,433.82
5. Step 5: Solve for x
   x = 1,017,737,262,433.82/864,012.10
6. Step 6: Final answer
   x = 1,177,920.15