Finding the Fourth Proportional to 42,688.05, 64,041.59 and 13,108.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42,688.05 : 64,041.59 = 13,108.88 : x
2. Step 2: Convert to fraction form
   42,688.05/64,041.59 = 13,108.88/x
3. Step 3: Cross multiply
   42,688.05x = 64,041.59 × 13,108.88
4. Step 4: Simplify right side
   42,688.05x = 839,513,132.57
5. Step 5: Solve for x
   x = 839,513,132.57/42,688.05
6. Step 6: Final answer
   x = 19,666.23