Finding the Fourth Proportional to 404,312.10, 606,468.15 and 137,984.10

Step by Step Solution

1. Step 1: Write the proportion equation
   404,312.10 : 606,468.15 = 137,984.10 : x
2. Step 2: Convert to fraction form
   404,312.10/606,468.15 = 137,984.10/x
3. Step 3: Cross multiply
   404,312.10x = 606,468.15 × 137,984.10
4. Step 4: Simplify right side
   404,312.10x = 83,682,961,856.42
5. Step 5: Solve for x
   x = 83,682,961,856.42/404,312.10
6. Step 6: Final answer
   x = 206,976.15