Finding the Fourth Proportional to 139,784.94, 209,626.38 and 51,012.18

Step by Step Solution

1. Step 1: Write the proportion equation
   139,784.94 : 209,626.38 = 51,012.18 : x
2. Step 2: Convert to fraction form
   139,784.94/209,626.38 = 51,012.18/x
3. Step 3: Cross multiply
   139,784.94x = 209,626.38 × 51,012.18
4. Step 4: Simplify right side
   139,784.94x = 10,693,498,629.31
5. Step 5: Solve for x
   x = 10,693,498,629.31/139,784.94
6. Step 6: Final answer
   x = 76,499.65