Finding the Fourth Proportional to 42,829.31, 64,243.76 and 28,567.64

Step by Step Solution

1. Step 1: Write the proportion equation
   42,829.31 : 64,243.76 = 28,567.64 : x
2. Step 2: Convert to fraction form
   42,829.31/64,243.76 = 28,567.64/x
3. Step 3: Cross multiply
   42,829.31x = 64,243.76 × 28,567.64
4. Step 4: Simplify right side
   42,829.31x = 1,835,292,839.95
5. Step 5: Solve for x
   x = 1,835,292,839.95/42,829.31
6. Step 6: Final answer
   x = 42,851.33