Finding the Fourth Proportional to 111,919.49, 154,401.77 and 74,128.13

Step by Step Solution

1. Step 1: Write the proportion equation
   111,919.49 : 154,401.77 = 74,128.13 : x
2. Step 2: Convert to fraction form
   111,919.49/154,401.77 = 74,128.13/x
3. Step 3: Cross multiply
   111,919.49x = 154,401.77 × 74,128.13
4. Step 4: Simplify right side
   111,919.49x = 11,445,514,108.15
5. Step 5: Solve for x
   x = 11,445,514,108.15/111,919.49
6. Step 6: Final answer
   x = 102,265.60