Finding the Fourth Proportional to 42,870.99, 64,284.85 and 25,107.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42,870.99 : 64,284.85 = 25,107.31 : x
2. Step 2: Convert to fraction form
   42,870.99/64,284.85 = 25,107.31/x
3. Step 3: Cross multiply
   42,870.99x = 64,284.85 × 25,107.31
4. Step 4: Simplify right side
   42,870.99x = 1,614,019,657.25
5. Step 5: Solve for x
   x = 1,614,019,657.25/42,870.99
6. Step 6: Final answer
   x = 37,648.29