Finding the Fourth Proportional to 870,670.72, 1,201,459.67 and 488,623.69

Step by Step Solution

1. Step 1: Write the proportion equation
   870,670.72 : 1,201,459.67 = 488,623.69 : x
2. Step 2: Convert to fraction form
   870,670.72/1,201,459.67 = 488,623.69/x
3. Step 3: Cross multiply
   870,670.72x = 1,201,459.67 × 488,623.69
4. Step 4: Simplify right side
   870,670.72x = 587,061,655,559.49
5. Step 5: Solve for x
   x = 587,061,655,559.49/870,670.72
6. Step 6: Final answer
   x = 674,263.70