Finding the Fourth Proportional to 231,522.72, 319,321.08 and 155,017.50

Step by Step Solution

1. Step 1: Write the proportion equation
   231,522.72 : 319,321.08 = 155,017.50 : x
2. Step 2: Convert to fraction form
   231,522.72/319,321.08 = 155,017.50/x
3. Step 3: Cross multiply
   231,522.72x = 319,321.08 × 155,017.50
4. Step 4: Simplify right side
   231,522.72x = 49,500,355,518.90
5. Step 5: Solve for x
   x = 49,500,355,518.90/231,522.72
6. Step 6: Final answer
   x = 213,803.45