Finding the Fourth Proportional to 149,196.12, 205,890.54 and 82,128.12

Step by Step Solution

1. Step 1: Write the proportion equation
   149,196.12 : 205,890.54 = 82,128.12 : x
2. Step 2: Convert to fraction form
   149,196.12/205,890.54 = 82,128.12/x
3. Step 3: Cross multiply
   149,196.12x = 205,890.54 × 82,128.12
4. Step 4: Simplify right side
   149,196.12x = 16,909,402,975.98
5. Step 5: Solve for x
   x = 16,909,402,975.98/149,196.12
6. Step 6: Final answer
   x = 113,336.75