Finding the Fourth Proportional to 144,428.55, 199,361.51 and 99,256.07

Step by Step Solution

1. Step 1: Write the proportion equation
   144,428.55 : 199,361.51 = 99,256.07 : x
2. Step 2: Convert to fraction form
   144,428.55/199,361.51 = 99,256.07/x
3. Step 3: Cross multiply
   144,428.55x = 199,361.51 × 99,256.07
4. Step 4: Simplify right side
   144,428.55x = 19,787,838,498.78
5. Step 5: Solve for x
   x = 19,787,838,498.78/144,428.55
6. Step 6: Final answer
   x = 137,007.80