Finding the Fourth Proportional to 899,890.71, 1,242,161.91 and 518,069.67

Step by Step Solution

1. Step 1: Write the proportion equation
   899,890.71 : 1,242,161.91 = 518,069.67 : x
2. Step 2: Convert to fraction form
   899,890.71/1,242,161.91 = 518,069.67/x
3. Step 3: Cross multiply
   899,890.71x = 1,242,161.91 × 518,069.67
4. Step 4: Simplify right side
   899,890.71x = 643,526,410,800.27
5. Step 5: Solve for x
   x = 643,526,410,800.27/899,890.71
6. Step 6: Final answer
   x = 715,116.18