Finding the Fourth Proportional to 405,290.72, 607,410.27 and 165,125.30

Step by Step Solution

1. Step 1: Write the proportion equation
   405,290.72 : 607,410.27 = 165,125.30 : x
2. Step 2: Convert to fraction form
   405,290.72/607,410.27 = 165,125.30/x
3. Step 3: Cross multiply
   405,290.72x = 607,410.27 × 165,125.30
4. Step 4: Simplify right side
   405,290.72x = 100,298,803,056.83
5. Step 5: Solve for x
   x = 100,298,803,056.83/405,290.72
6. Step 6: Final answer
   x = 247,473.72