Finding the Fourth Proportional to 52,140.91, 78,222.75 and 18,857.50

Step by Step Solution

1. Step 1: Write the proportion equation
   52,140.91 : 78,222.75 = 18,857.50 : x
2. Step 2: Convert to fraction form
   52,140.91/78,222.75 = 18,857.50/x
3. Step 3: Cross multiply
   52,140.91x = 78,222.75 × 18,857.50
4. Step 4: Simplify right side
   52,140.91x = 1,475,085,022.72
5. Step 5: Solve for x
   x = 1,475,085,022.72/52,140.91
6. Step 6: Final answer
   x = 28,290.36