Finding the Fourth Proportional to 42,317.52, 63,428.76 and 20,112.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,317.52 : 63,428.76 = 20,112.72 : x
2. Step 2: Convert to fraction form
   42,317.52/63,428.76 = 20,112.72/x
3. Step 3: Cross multiply
   42,317.52x = 63,428.76 × 20,112.72
4. Step 4: Simplify right side
   42,317.52x = 1,275,724,889.83
5. Step 5: Solve for x
   x = 1,275,724,889.83/42,317.52
6. Step 6: Final answer
   x = 30,146.49