Finding the Fourth Proportional to 103,638.15, 155,198.02 and 82,902.15

Step by Step Solution

1. Step 1: Write the proportion equation
   103,638.15 : 155,198.02 = 82,902.15 : x
2. Step 2: Convert to fraction form
   103,638.15/155,198.02 = 82,902.15/x
3. Step 3: Cross multiply
   103,638.15x = 155,198.02 × 82,902.15
4. Step 4: Simplify right side
   103,638.15x = 12,866,249,533.74
5. Step 5: Solve for x
   x = 12,866,249,533.74/103,638.15
6. Step 6: Final answer
   x = 124,145.88