Finding the Fourth Proportional to 37,123.45, 51,229.74 and 20,990.50

Step by Step Solution

1. Step 1: Write the proportion equation
   37,123.45 : 51,229.74 = 20,990.50 : x
2. Step 2: Convert to fraction form
   37,123.45/51,229.74 = 20,990.50/x
3. Step 3: Cross multiply
   37,123.45x = 51,229.74 × 20,990.50
4. Step 4: Simplify right side
   37,123.45x = 1,075,337,857.47
5. Step 5: Solve for x
   x = 1,075,337,857.47/37,123.45
6. Step 6: Final answer
   x = 28,966.54