Finding the Fourth Proportional to 42,953.69, 64,455.65 and 17,991.62

Step by Step Solution

1. Step 1: Write the proportion equation
   42,953.69 : 64,455.65 = 17,991.62 : x
2. Step 2: Convert to fraction form
   42,953.69/64,455.65 = 17,991.62/x
3. Step 3: Cross multiply
   42,953.69x = 64,455.65 × 17,991.62
4. Step 4: Simplify right side
   42,953.69x = 1,159,661,458.59
5. Step 5: Solve for x
   x = 1,159,661,458.59/42,953.69
6. Step 6: Final answer
   x = 26,997.95