Finding the Fourth Proportional to 67,885.50, 101,828.43 and 21,138.42

Step by Step Solution

1. Step 1: Write the proportion equation
   67,885.50 : 101,828.43 = 21,138.42 : x
2. Step 2: Convert to fraction form
   67,885.50/101,828.43 = 21,138.42/x
3. Step 3: Cross multiply
   67,885.50x = 101,828.43 × 21,138.42
4. Step 4: Simplify right side
   67,885.50x = 2,152,492,121.28
5. Step 5: Solve for x
   x = 2,152,492,121.28/67,885.50
6. Step 6: Final answer
   x = 31,707.69