Finding the Fourth Proportional to 111,225.72, 153,420.84 and 72,987.78

Step by Step Solution

1. Step 1: Write the proportion equation
   111,225.72 : 153,420.84 = 72,987.78 : x
2. Step 2: Convert to fraction form
   111,225.72/153,420.84 = 72,987.78/x
3. Step 3: Cross multiply
   111,225.72x = 153,420.84 × 72,987.78
4. Step 4: Simplify right side
   111,225.72x = 11,197,846,517.34
5. Step 5: Solve for x
   x = 11,197,846,517.34/111,225.72
6. Step 6: Final answer
   x = 100,676.77