Finding the Fourth Proportional to 305,123.58, 421,095.39 and 169,200.15

Step by Step Solution

1. Step 1: Write the proportion equation
   305,123.58 : 421,095.39 = 169,200.15 : x
2. Step 2: Convert to fraction form
   305,123.58/421,095.39 = 169,200.15/x
3. Step 3: Cross multiply
   305,123.58x = 421,095.39 × 169,200.15
4. Step 4: Simplify right side
   305,123.58x = 71,249,403,152.31
5. Step 5: Solve for x
   x = 71,249,403,152.31/305,123.58
6. Step 6: Final answer
   x = 233,509.99