Finding the Fourth Proportional to 67,838.80, 101,757.72 and 21,091.60

Step by Step Solution

1. Step 1: Write the proportion equation
   67,838.80 : 101,757.72 = 21,091.60 : x
2. Step 2: Convert to fraction form
   67,838.80/101,757.72 = 21,091.60/x
3. Step 3: Cross multiply
   67,838.80x = 101,757.72 × 21,091.60
4. Step 4: Simplify right side
   67,838.80x = 2,146,233,127.15
5. Step 5: Solve for x
   x = 2,146,233,127.15/67,838.80
6. Step 6: Final answer
   x = 31,637.25