Finding the Fourth Proportional to 37,308.48, 51,479.68 and 21,390

Step by Step Solution

1. Step 1: Write the proportion equation
   37,308.48 : 51,479.68 = 21,390 : x
2. Step 2: Convert to fraction form
   37,308.48/51,479.68 = 21,390/x
3. Step 3: Cross multiply
   37,308.48x = 51,479.68 × 21,390
4. Step 4: Simplify right side
   37,308.48x = 1,101,150,355.20
5. Step 5: Solve for x
   x = 1,101,150,355.20/37,308.48
6. Step 6: Final answer
   x = 29,514.75