Finding the Fourth Proportional to 210,540.89, 290,553.59 and 115,053.75

Step by Step Solution

1. Step 1: Write the proportion equation
   210,540.89 : 290,553.59 = 115,053.75 : x
2. Step 2: Convert to fraction form
   210,540.89/290,553.59 = 115,053.75/x
3. Step 3: Cross multiply
   210,540.89x = 290,553.59 × 115,053.75
4. Step 4: Simplify right side
   210,540.89x = 33,429,280,393.10
5. Step 5: Solve for x
   x = 33,429,280,393.10/210,540.89
6. Step 6: Final answer
   x = 158,778.09