Finding the Fourth Proportional to 1,903.47, 2,856.29 and 807.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,903.47 : 2,856.29 = 807.72 : x
2. Step 2: Convert to fraction form
   1,903.47/2,856.29 = 807.72/x
3. Step 3: Cross multiply
   1,903.47x = 2,856.29 × 807.72
4. Step 4: Simplify right side
   1,903.47x = 2,307,078.52
5. Step 5: Solve for x
   x = 2,307,078.52/1,903.47
6. Step 6: Final answer
   x = 1,212.04