Finding the Fourth Proportional to 37,405.30, 51,621.30 and 21,490.78

Step by Step Solution

1. Step 1: Write the proportion equation
   37,405.30 : 51,621.30 = 21,490.78 : x
2. Step 2: Convert to fraction form
   37,405.30/51,621.30 = 21,490.78/x
3. Step 3: Cross multiply
   37,405.30x = 51,621.30 × 21,490.78
4. Step 4: Simplify right side
   37,405.30x = 1,109,382,001.61
5. Step 5: Solve for x
   x = 1,109,382,001.61/37,405.30
6. Step 6: Final answer
   x = 29,658.42