Finding the Fourth Proportional to 2,100.86, 3,151.05 and 802.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.86 : 3,151.05 = 802.30 : x
2. Step 2: Convert to fraction form
   2,100.86/3,151.05 = 802.30/x
3. Step 3: Cross multiply
   2,100.86x = 3,151.05 × 802.30
4. Step 4: Simplify right side
   2,100.86x = 2,528,087.42
5. Step 5: Solve for x
   x = 2,528,087.42/2,100.86
6. Step 6: Final answer
   x = 1,203.36