Finding the Fourth Proportional to 78,470.72, 108,288.72 and 58,417.28

Step by Step Solution

1. Step 1: Write the proportion equation
   78,470.72 : 108,288.72 = 58,417.28 : x
2. Step 2: Convert to fraction form
   78,470.72/108,288.72 = 58,417.28/x
3. Step 3: Cross multiply
   78,470.72x = 108,288.72 × 58,417.28
4. Step 4: Simplify right side
   78,470.72x = 6,325,932,477.08
5. Step 5: Solve for x
   x = 6,325,932,477.08/78,470.72
6. Step 6: Final answer
   x = 80,615.20