Finding the Fourth Proportional to 37,172.59, 55,663.61 and 20,513.99

Step by Step Solution

1. Step 1: Write the proportion equation
   37,172.59 : 55,663.61 = 20,513.99 : x
2. Step 2: Convert to fraction form
   37,172.59/55,663.61 = 20,513.99/x
3. Step 3: Cross multiply
   37,172.59x = 55,663.61 × 20,513.99
4. Step 4: Simplify right side
   37,172.59x = 1,141,882,775.49
5. Step 5: Solve for x
   x = 1,141,882,775.49/37,172.59
6. Step 6: Final answer
   x = 30,718.41