Finding the Fourth Proportional to 899,892.71, 1,242,164.67 and 518,071.67

Step by Step Solution

1. Step 1: Write the proportion equation
   899,892.71 : 1,242,164.67 = 518,071.67 : x
2. Step 2: Convert to fraction form
   899,892.71/1,242,164.67 = 518,071.67/x
3. Step 3: Cross multiply
   899,892.71x = 1,242,164.67 × 518,071.67
4. Step 4: Simplify right side
   899,892.71x = 643,530,325,001.90
5. Step 5: Solve for x
   x = 643,530,325,001.90/899,892.71
6. Step 6: Final answer
   x = 715,118.94