Finding the Fourth Proportional to 361,071.50, 498,238.42 and 199,886.18

Step by Step Solution

1. Step 1: Write the proportion equation
   361,071.50 : 498,238.42 = 199,886.18 : x
2. Step 2: Convert to fraction form
   361,071.50/498,238.42 = 199,886.18/x
3. Step 3: Cross multiply
   361,071.50x = 498,238.42 × 199,886.18
4. Step 4: Simplify right side
   361,071.50x = 99,590,974,503.04
5. Step 5: Solve for x
   x = 99,590,974,503.04/361,071.50
6. Step 6: Final answer
   x = 275,820.65