Finding the Fourth Proportional to 78,570.72, 117,835.68 and 28,642.08

Step by Step Solution

1. Step 1: Write the proportion equation
   78,570.72 : 117,835.68 = 28,642.08 : x
2. Step 2: Convert to fraction form
   78,570.72/117,835.68 = 28,642.08/x
3. Step 3: Cross multiply
   78,570.72x = 117,835.68 × 28,642.08
4. Step 4: Simplify right side
   78,570.72x = 3,375,058,973.41
5. Step 5: Solve for x
   x = 3,375,058,973.41/78,570.72
6. Step 6: Final answer
   x = 42,955.68