Finding the Fourth Proportional to 139,815.33, 209,515.61 and 102,697.89

Step by Step Solution

1. Step 1: Write the proportion equation
   139,815.33 : 209,515.61 = 102,697.89 : x
2. Step 2: Convert to fraction form
   139,815.33/209,515.61 = 102,697.89/x
3. Step 3: Cross multiply
   139,815.33x = 209,515.61 × 102,697.89
4. Step 4: Simplify right side
   139,815.33x = 21,516,810,555.57
5. Step 5: Solve for x
   x = 21,516,810,555.57/139,815.33
6. Step 6: Final answer
   x = 153,894.50