Finding the Fourth Proportional to 42,969.79, 64,457.79 and 17,984.71

Step by Step Solution

1. Step 1: Write the proportion equation
   42,969.79 : 64,457.79 = 17,984.71 : x
2. Step 2: Convert to fraction form
   42,969.79/64,457.79 = 17,984.71/x
3. Step 3: Cross multiply
   42,969.79x = 64,457.79 × 17,984.71
4. Step 4: Simplify right side
   42,969.79x = 1,159,254,660.39
5. Step 5: Solve for x
   x = 1,159,254,660.39/42,969.79
6. Step 6: Final answer
   x = 26,978.36