Finding the Fourth Proportional to 42,891.48, 64,339.27 and 20,723.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,891.48 : 64,339.27 = 20,723.50 : x
2. Step 2: Convert to fraction form
   42,891.48/64,339.27 = 20,723.50/x
3. Step 3: Cross multiply
   42,891.48x = 64,339.27 × 20,723.50
4. Step 4: Simplify right side
   42,891.48x = 1,333,334,861.85
5. Step 5: Solve for x
   x = 1,333,334,861.85/42,891.48
6. Step 6: Final answer
   x = 31,086.24