Finding the Fourth Proportional to 124,780, 187,116.72 and 72,225.76

Step by Step Solution

1. Step 1: Write the proportion equation
   124,780 : 187,116.72 = 72,225.76 : x
2. Step 2: Convert to fraction form
   124,780/187,116.72 = 72,225.76/x
3. Step 3: Cross multiply
   124,780x = 187,116.72 × 72,225.76
4. Step 4: Simplify right side
   124,780x = 13,514,647,310.71
5. Step 5: Solve for x
   x = 13,514,647,310.71/124,780
6. Step 6: Final answer
   x = 108,307.80