Finding the Fourth Proportional to 42,687.37, 64,017.21 and 14,216.74

Step by Step Solution

1. Step 1: Write the proportion equation
   42,687.37 : 64,017.21 = 14,216.74 : x
2. Step 2: Convert to fraction form
   42,687.37/64,017.21 = 14,216.74/x
3. Step 3: Cross multiply
   42,687.37x = 64,017.21 × 14,216.74
4. Step 4: Simplify right side
   42,687.37x = 910,116,030.10
5. Step 5: Solve for x
   x = 910,116,030.10/42,687.37
6. Step 6: Final answer
   x = 21,320.50