Finding the Fourth Proportional to 42,709.58, 64,064.59 and 28,011.57

Step by Step Solution

1. Step 1: Write the proportion equation
   42,709.58 : 64,064.59 = 28,011.57 : x
2. Step 2: Convert to fraction form
   42,709.58/64,064.59 = 28,011.57/x
3. Step 3: Cross multiply
   42,709.58x = 64,064.59 × 28,011.57
4. Step 4: Simplify right side
   42,709.58x = 1,794,549,286.93
5. Step 5: Solve for x
   x = 1,794,549,286.93/42,709.58
6. Step 6: Final answer
   x = 42,017.49