Finding the Fourth Proportional to 406,581, 561,081.78 and 247,605

Step by Step Solution

1. Step 1: Write the proportion equation
   406,581 : 561,081.78 = 247,605 : x
2. Step 2: Convert to fraction form
   406,581/561,081.78 = 247,605/x
3. Step 3: Cross multiply
   406,581x = 561,081.78 × 247,605
4. Step 4: Simplify right side
   406,581x = 138,926,654,136.90
5. Step 5: Solve for x
   x = 138,926,654,136.90/406,581
6. Step 6: Final answer
   x = 341,694.90