Finding the Fourth Proportional to 42,780.72, 64,166.17 and 11,193.83

Step by Step Solution

1. Step 1: Write the proportion equation
   42,780.72 : 64,166.17 = 11,193.83 : x
2. Step 2: Convert to fraction form
   42,780.72/64,166.17 = 11,193.83/x
3. Step 3: Cross multiply
   42,780.72x = 64,166.17 × 11,193.83
4. Step 4: Simplify right side
   42,780.72x = 718,265,080.04
5. Step 5: Solve for x
   x = 718,265,080.04/42,780.72
6. Step 6: Final answer
   x = 16,789.46