Finding the Fourth Proportional to 72,859.74, 109,317.15 and 28,518.18

Step by Step Solution

1. Step 1: Write the proportion equation
   72,859.74 : 109,317.15 = 28,518.18 : x
2. Step 2: Convert to fraction form
   72,859.74/109,317.15 = 28,518.18/x
3. Step 3: Cross multiply
   72,859.74x = 109,317.15 × 28,518.18
4. Step 4: Simplify right side
   72,859.74x = 3,117,526,160.79
5. Step 5: Solve for x
   x = 3,117,526,160.79/72,859.74
6. Step 6: Final answer
   x = 42,788.05