Finding the Fourth Proportional to 37,911.92, 52,305.72 and 21,990.56

Step by Step Solution

1. Step 1: Write the proportion equation
   37,911.92 : 52,305.72 = 21,990.56 : x
2. Step 2: Convert to fraction form
   37,911.92/52,305.72 = 21,990.56/x
3. Step 3: Cross multiply
   37,911.92x = 52,305.72 × 21,990.56
4. Step 4: Simplify right side
   37,911.92x = 1,150,232,074.00
5. Step 5: Solve for x
   x = 1,150,232,074.00/37,911.92
6. Step 6: Final answer
   x = 30,339.59