Finding the Fourth Proportional to 37,485.78, 51,730.42 and 20,718.78

Step by Step Solution

1. Step 1: Write the proportion equation
   37,485.78 : 51,730.42 = 20,718.78 : x
2. Step 2: Convert to fraction form
   37,485.78/51,730.42 = 20,718.78/x
3. Step 3: Cross multiply
   37,485.78x = 51,730.42 × 20,718.78
4. Step 4: Simplify right side
   37,485.78x = 1,071,791,191.29
5. Step 5: Solve for x
   x = 1,071,791,191.29/37,485.78
6. Step 6: Final answer
   x = 28,591.94