Finding the Fourth Proportional to 42,708.48, 64,026.27 and 30,189.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42,708.48 : 64,026.27 = 30,189.12 : x
2. Step 2: Convert to fraction form
   42,708.48/64,026.27 = 30,189.12/x
3. Step 3: Cross multiply
   42,708.48x = 64,026.27 × 30,189.12
4. Step 4: Simplify right side
   42,708.48x = 1,932,896,748.18
5. Step 5: Solve for x
   x = 1,932,896,748.18/42,708.48
6. Step 6: Final answer
   x = 45,257.91