Finding the Fourth Proportional to 42,749.78, 64,128.31 and 11,164.03

Step by Step Solution

1. Step 1: Write the proportion equation
   42,749.78 : 64,128.31 = 11,164.03 : x
2. Step 2: Convert to fraction form
   42,749.78/64,128.31 = 11,164.03/x
3. Step 3: Cross multiply
   42,749.78x = 64,128.31 × 11,164.03
4. Step 4: Simplify right side
   42,749.78x = 715,930,188.46
5. Step 5: Solve for x
   x = 715,930,188.46/42,749.78
6. Step 6: Final answer
   x = 16,746.99