Finding the Fourth Proportional to 37,043.69, 51,119.76 and 21,128.40

Step by Step Solution

1. Step 1: Write the proportion equation
   37,043.69 : 51,119.76 = 21,128.40 : x
2. Step 2: Convert to fraction form
   37,043.69/51,119.76 = 21,128.40/x
3. Step 3: Cross multiply
   37,043.69x = 51,119.76 × 21,128.40
4. Step 4: Simplify right side
   37,043.69x = 1,080,078,816.42
5. Step 5: Solve for x
   x = 1,080,078,816.42/37,043.69
6. Step 6: Final answer
   x = 29,156.89