Finding the Fourth Proportional to 42,818.61, 64,144.80 and 31,553.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,818.61 : 64,144.80 = 31,553.50 : x
2. Step 2: Convert to fraction form
   42,818.61/64,144.80 = 31,553.50/x
3. Step 3: Cross multiply
   42,818.61x = 64,144.80 × 31,553.50
4. Step 4: Simplify right side
   42,818.61x = 2,023,992,789.03
5. Step 5: Solve for x
   x = 2,023,992,789.03/42,818.61
6. Step 6: Final answer
   x = 47,269.00