Finding the Fourth Proportional to 37,687.20, 56,493.60 and 21,055.20

Step by Step Solution

1. Step 1: Write the proportion equation
   37,687.20 : 56,493.60 = 21,055.20 : x
2. Step 2: Convert to fraction form
   37,687.20/56,493.60 = 21,055.20/x
3. Step 3: Cross multiply
   37,687.20x = 56,493.60 × 21,055.20
4. Step 4: Simplify right side
   37,687.20x = 1,189,484,046.72
5. Step 5: Solve for x
   x = 1,189,484,046.72/37,687.20
6. Step 6: Final answer
   x = 31,562.02