Finding the Fourth Proportional to 83,485, 125,234.79 and 21,155.50

Step by Step Solution

1. Step 1: Write the proportion equation
   83,485 : 125,234.79 = 21,155.50 : x
2. Step 2: Convert to fraction form
   83,485/125,234.79 = 21,155.50/x
3. Step 3: Cross multiply
   83,485x = 125,234.79 × 21,155.50
4. Step 4: Simplify right side
   83,485x = 2,649,404,599.85
5. Step 5: Solve for x
   x = 2,649,404,599.85/83,485
6. Step 6: Final answer
   x = 31,735.10