Finding the Fourth Proportional to 354,674.10, 530,715.15 and 261,362.10

Step by Step Solution

1. Step 1: Write the proportion equation
   354,674.10 : 530,715.15 = 261,362.10 : x
2. Step 2: Convert to fraction form
   354,674.10/530,715.15 = 261,362.10/x
3. Step 3: Cross multiply
   354,674.10x = 530,715.15 × 261,362.10
4. Step 4: Simplify right side
   354,674.10x = 138,708,826,105.82
5. Step 5: Solve for x
   x = 138,708,826,105.82/354,674.10
6. Step 6: Final answer
   x = 391,088.12