Finding the Fourth Proportional to 144,290.22, 216,429.18 and 140,911.30

Step by Step Solution

1. Step 1: Write the proportion equation
   144,290.22 : 216,429.18 = 140,911.30 : x
2. Step 2: Convert to fraction form
   144,290.22/216,429.18 = 140,911.30/x
3. Step 3: Cross multiply
   144,290.22x = 216,429.18 × 140,911.30
4. Step 4: Simplify right side
   144,290.22x = 30,497,316,407.18
5. Step 5: Solve for x
   x = 30,497,316,407.18/144,290.22
6. Step 6: Final answer
   x = 211,360.95