Finding the Fourth Proportional to 37,290.72, 51,449.60 and 21,155.36

Step by Step Solution

1. Step 1: Write the proportion equation
   37,290.72 : 51,449.60 = 21,155.36 : x
2. Step 2: Convert to fraction form
   37,290.72/51,449.60 = 21,155.36/x
3. Step 3: Cross multiply
   37,290.72x = 51,449.60 × 21,155.36
4. Step 4: Simplify right side
   37,290.72x = 1,088,434,809.86
5. Step 5: Solve for x
   x = 1,088,434,809.86/37,290.72
6. Step 6: Final answer
   x = 29,187.82