Finding the Fourth Proportional to 144,468.72, 216,465.94 and 138,931.96

Step by Step Solution

1. Step 1: Write the proportion equation
   144,468.72 : 216,465.94 = 138,931.96 : x
2. Step 2: Convert to fraction form
   144,468.72/216,465.94 = 138,931.96/x
3. Step 3: Cross multiply
   144,468.72x = 216,465.94 × 138,931.96
4. Step 4: Simplify right side
   144,468.72x = 30,074,037,317.44
5. Step 5: Solve for x
   x = 30,074,037,317.44/144,468.72
6. Step 6: Final answer
   x = 208,169.89