Finding the Fourth Proportional to 231,521.72, 319,319.70 and 155,016.50

Step by Step Solution

1. Step 1: Write the proportion equation
   231,521.72 : 319,319.70 = 155,016.50 : x
2. Step 2: Convert to fraction form
   231,521.72/319,319.70 = 155,016.50/x
3. Step 3: Cross multiply
   231,521.72x = 319,319.70 × 155,016.50
4. Step 4: Simplify right side
   231,521.72x = 49,499,822,275.05
5. Step 5: Solve for x
   x = 49,499,822,275.05/231,521.72
6. Step 6: Final answer
   x = 213,802.07