Finding the Fourth Proportional to 209,116.86, 313,498.94 and 90,699

Step by Step Solution

1. Step 1: Write the proportion equation
   209,116.86 : 313,498.94 = 90,699 : x
2. Step 2: Convert to fraction form
   209,116.86/313,498.94 = 90,699/x
3. Step 3: Cross multiply
   209,116.86x = 313,498.94 × 90,699
4. Step 4: Simplify right side
   209,116.86x = 28,434,040,359.06
5. Step 5: Solve for x
   x = 28,434,040,359.06/209,116.86
6. Step 6: Final answer
   x = 135,972.01