Finding the Fourth Proportional to 139,797.51, 209,488.89 and 102,680.07

Step by Step Solution

1. Step 1: Write the proportion equation
   139,797.51 : 209,488.89 = 102,680.07 : x
2. Step 2: Convert to fraction form
   139,797.51/209,488.89 = 102,680.07/x
3. Step 3: Cross multiply
   139,797.51x = 209,488.89 × 102,680.07
4. Step 4: Simplify right side
   139,797.51x = 21,510,333,488.89
5. Step 5: Solve for x
   x = 21,510,333,488.89/139,797.51
6. Step 6: Final answer
   x = 153,867.79