Finding the Fourth Proportional to 42,991.72, 64,462.73 and 16,665.70

Step by Step Solution

1. Step 1: Write the proportion equation
   42,991.72 : 64,462.73 = 16,665.70 : x
2. Step 2: Convert to fraction form
   42,991.72/64,462.73 = 16,665.70/x
3. Step 3: Cross multiply
   42,991.72x = 64,462.73 × 16,665.70
4. Step 4: Simplify right side
   42,991.72x = 1,074,316,519.36
5. Step 5: Solve for x
   x = 1,074,316,519.36/42,991.72
6. Step 6: Final answer
   x = 24,988.92