Finding the Fourth Proportional to 307,164.34, 423,908.06 and 186,310.72

Step by Step Solution

1. Step 1: Write the proportion equation
   307,164.34 : 423,908.06 = 186,310.72 : x
2. Step 2: Convert to fraction form
   307,164.34/423,908.06 = 186,310.72/x
3. Step 3: Cross multiply
   307,164.34x = 423,908.06 × 186,310.72
4. Step 4: Simplify right side
   307,164.34x = 78,978,612,821.31
5. Step 5: Solve for x
   x = 78,978,612,821.31/307,164.34
6. Step 6: Final answer
   x = 257,121.69