Finding the Fourth Proportional to 42,710.07, 64,065.34 and 28,012.07

Step by Step Solution

1. Step 1: Write the proportion equation
   42,710.07 : 64,065.34 = 28,012.07 : x
2. Step 2: Convert to fraction form
   42,710.07/64,065.34 = 28,012.07/x
3. Step 3: Cross multiply
   42,710.07x = 64,065.34 × 28,012.07
4. Step 4: Simplify right side
   42,710.07x = 1,794,602,788.65
5. Step 5: Solve for x
   x = 1,794,602,788.65/42,710.07
6. Step 6: Final answer
   x = 42,018.26