Finding the Fourth Proportional to 406,015.84, 609,064.71 and 139,741.30

Step by Step Solution

1. Step 1: Write the proportion equation
   406,015.84 : 609,064.71 = 139,741.30 : x
2. Step 2: Convert to fraction form
   406,015.84/609,064.71 = 139,741.30/x
3. Step 3: Cross multiply
   406,015.84x = 609,064.71 × 139,741.30
4. Step 4: Simplify right side
   406,015.84x = 85,111,494,359.52
5. Step 5: Solve for x
   x = 85,111,494,359.52/406,015.84
6. Step 6: Final answer
   x = 209,626.04