Finding the Fourth Proportional to 42,667.74, 64,034.28 and 19,310.58

Step by Step Solution

1. Step 1: Write the proportion equation
   42,667.74 : 64,034.28 = 19,310.58 : x
2. Step 2: Convert to fraction form
   42,667.74/64,034.28 = 19,310.58/x
3. Step 3: Cross multiply
   42,667.74x = 64,034.28 × 19,310.58
4. Step 4: Simplify right side
   42,667.74x = 1,236,539,086.68
5. Step 5: Solve for x
   x = 1,236,539,086.68/42,667.74
6. Step 6: Final answer
   x = 28,980.66