Finding the Fourth Proportional to 42,661.16, 64,013.34 and 28,781

Step by Step Solution

1. Step 1: Write the proportion equation
   42,661.16 : 64,013.34 = 28,781 : x
2. Step 2: Convert to fraction form
   42,661.16/64,013.34 = 28,781/x
3. Step 3: Cross multiply
   42,661.16x = 64,013.34 × 28,781
4. Step 4: Simplify right side
   42,661.16x = 1,842,367,938.54
5. Step 5: Solve for x
   x = 1,842,367,938.54/42,661.16
6. Step 6: Final answer
   x = 43,186.07