Finding the Fourth Proportional to 269,145.72, 371,421.72 and 154,428.48

Step by Step Solution

1. Step 1: Write the proportion equation
   269,145.72 : 371,421.72 = 154,428.48 : x
2. Step 2: Convert to fraction form
   269,145.72/371,421.72 = 154,428.48/x
3. Step 3: Cross multiply
   269,145.72x = 371,421.72 × 154,428.48
4. Step 4: Simplify right side
   269,145.72x = 57,358,091,658.59
5. Step 5: Solve for x
   x = 57,358,091,658.59/269,145.72
6. Step 6: Final answer
   x = 213,111.66