Finding the Fourth Proportional to 42,870.24, 64,279.44 and 28,977.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42,870.24 : 64,279.44 = 28,977.12 : x
2. Step 2: Convert to fraction form
   42,870.24/64,279.44 = 28,977.12/x
3. Step 3: Cross multiply
   42,870.24x = 64,279.44 × 28,977.12
4. Step 4: Simplify right side
   42,870.24x = 1,862,633,046.41
5. Step 5: Solve for x
   x = 1,862,633,046.41/42,870.24
6. Step 6: Final answer
   x = 43,448.16