Finding the Fourth Proportional to 42,719.05, 64,101.70 and 17,776.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42,719.05 : 64,101.70 = 17,776.31 : x
2. Step 2: Convert to fraction form
   42,719.05/64,101.70 = 17,776.31/x
3. Step 3: Cross multiply
   42,719.05x = 64,101.70 × 17,776.31
4. Step 4: Simplify right side
   42,719.05x = 1,139,491,803.01
5. Step 5: Solve for x
   x = 1,139,491,803.01/42,719.05
6. Step 6: Final answer
   x = 26,674.09