Finding the Fourth Proportional to 892,621.72, 1,231,826.70 and 490,213.72

Step by Step Solution

1. Step 1: Write the proportion equation
   892,621.72 : 1,231,826.70 = 490,213.72 : x
2. Step 2: Convert to fraction form
   892,621.72/1,231,826.70 = 490,213.72/x
3. Step 3: Cross multiply
   892,621.72x = 1,231,826.70 × 490,213.72
4. Step 4: Simplify right side
   892,621.72x = 603,858,349,002.32
5. Step 5: Solve for x
   x = 603,858,349,002.32/892,621.72
6. Step 6: Final answer
   x = 676,499.73