Finding the Fourth Proportional to 66,021.72, 91,116.20 and 37,721.92

Step by Step Solution

1. Step 1: Write the proportion equation
   66,021.72 : 91,116.20 = 37,721.92 : x
2. Step 2: Convert to fraction form
   66,021.72/91,116.20 = 37,721.92/x
3. Step 3: Cross multiply
   66,021.72x = 91,116.20 × 37,721.92
4. Step 4: Simplify right side
   66,021.72x = 3,437,078,007.10
5. Step 5: Solve for x
   x = 3,437,078,007.10/66,021.72
6. Step 6: Final answer
   x = 52,059.81