Finding the Fourth Proportional to 103,639.15, 155,199.52 and 82,903.15

Step by Step Solution

1. Step 1: Write the proportion equation
   103,639.15 : 155,199.52 = 82,903.15 : x
2. Step 2: Convert to fraction form
   103,639.15/155,199.52 = 82,903.15/x
3. Step 3: Cross multiply
   103,639.15x = 155,199.52 × 82,903.15
4. Step 4: Simplify right side
   103,639.15x = 12,866,529,086.49
5. Step 5: Solve for x
   x = 12,866,529,086.49/103,639.15
6. Step 6: Final answer
   x = 124,147.38