Finding the Fourth Proportional to 2,105.51, 3,156.98 and 807.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.51 : 3,156.98 = 807.08 : x
2. Step 2: Convert to fraction form
   2,105.51/3,156.98 = 807.08/x
3. Step 3: Cross multiply
   2,105.51x = 3,156.98 × 807.08
4. Step 4: Simplify right side
   2,105.51x = 2,547,915.60
5. Step 5: Solve for x
   x = 2,547,915.60/2,105.51
6. Step 6: Final answer
   x = 1,210.12