Finding the Fourth Proportional to 899,279.82, 1,240,969.15 and 491,395.67

Step by Step Solution

1. Step 1: Write the proportion equation
   899,279.82 : 1,240,969.15 = 491,395.67 : x
2. Step 2: Convert to fraction form
   899,279.82/1,240,969.15 = 491,395.67/x
3. Step 3: Cross multiply
   899,279.82x = 1,240,969.15 × 491,395.67
4. Step 4: Simplify right side
   899,279.82x = 609,806,866,913.58
5. Step 5: Solve for x
   x = 609,806,866,913.58/899,279.82
6. Step 6: Final answer
   x = 678,105.81