Finding the Fourth Proportional to 105,662.67, 145,819 and 63,213

Step by Step Solution

1. Step 1: Write the proportion equation
   105,662.67 : 145,819 = 63,213 : x
2. Step 2: Convert to fraction form
   105,662.67/145,819 = 63,213/x
3. Step 3: Cross multiply
   105,662.67x = 145,819 × 63,213
4. Step 4: Simplify right side
   105,662.67x = 9,217,656,447
5. Step 5: Solve for x
   x = 9,217,656,447/105,662.67
6. Step 6: Final answer
   x = 87,236.64