Finding the Fourth Proportional to 42,934.86, 64,369.89 and 28,147.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,934.86 : 64,369.89 = 28,147.50 : x
2. Step 2: Convert to fraction form
   42,934.86/64,369.89 = 28,147.50/x
3. Step 3: Cross multiply
   42,934.86x = 64,369.89 × 28,147.50
4. Step 4: Simplify right side
   42,934.86x = 1,811,851,478.78
5. Step 5: Solve for x
   x = 1,811,851,478.78/42,934.86
6. Step 6: Final answer
   x = 42,200.01