Finding the Fourth Proportional to 42,799.08, 64,175.10 and 13,208.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,799.08 : 64,175.10 = 13,208.76 : x
2. Step 2: Convert to fraction form
   42,799.08/64,175.10 = 13,208.76/x
3. Step 3: Cross multiply
   42,799.08x = 64,175.10 × 13,208.76
4. Step 4: Simplify right side
   42,799.08x = 847,673,493.88
5. Step 5: Solve for x
   x = 847,673,493.88/42,799.08
6. Step 6: Final answer
   x = 19,805.88