Finding the Fourth Proportional to 231,521.31, 319,476.83 and 129,540.69

Step by Step Solution

1. Step 1: Write the proportion equation
   231,521.31 : 319,476.83 = 129,540.69 : x
2. Step 2: Convert to fraction form
   231,521.31/319,476.83 = 129,540.69/x
3. Step 3: Cross multiply
   231,521.31x = 319,476.83 × 129,540.69
4. Step 4: Simplify right side
   231,521.31x = 41,385,248,349.51
5. Step 5: Solve for x
   x = 41,385,248,349.51/231,521.31
6. Step 6: Final answer
   x = 178,753.52